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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(D) OF THE
SECURITIES EXCHANGE ACT OF 1934
Date of report (Date of earliest event reported): July 28, 2021
AFFILIATED MANAGERS GROUP, INC.
(Exact Name of Registrant as Specified in Its Charter)
Delaware
(State or Other Jurisdiction of Incorporation)
001-13459 04-3218510
(Commission File Number) (IRS Employer Identification No.)
777 South Flagler Drive, West Palm Beach, Florida 33401
(Address of principal executive offices)
(800) 345-1100
(Registrant’s Telephone Number, Including Area Code)
N/A
(Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Stock ($0.01 par value)AMGNew York Stock Exchange
5.875% Junior Subordinated Notes due 2059MGRNew York Stock Exchange
4.750% Junior Subordinated Notes due 2060MGRBNew York Stock Exchange
4.200% Junior Subordinated Notes due 2061MGRDNew York Stock Exchange
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company    
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐




ITEM 2.02Results of Operations and Financial Condition.
On July 28, 2021, Affiliated Managers Group, Inc. (the “Company”) issued a press release setting forth its financial and operating results for the quarter ended June 30, 2021.
 
ITEM 8.01Other Events.
The press release announced that the Company’s Board of Directors authorized and declared a quarterly dividend of $0.01 per share of common stock, payable August 20, 2021 to stockholders of record as of the close of business on August 6, 2021.
A copy of the press release is furnished as Exhibit 99.1 hereto, except for such portions which are filed, as noted below under Item 9.01.
 
ITEM 9.01Financial Statements and Exhibits.
 
(d)Exhibits.
The financial highlights table set forth on page 1 and the financial tables set forth on pages 3 through 8 in Exhibit 99.1 hereto are “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and shall be deemed incorporated by reference into the filings of the Company under the Securities Act of 1933, as amended. The remaining information in Exhibit 99.1 is being “furnished” to the Securities and Exchange Commission as provided pursuant to General Instruction B.2 of Form 8-K.

Exhibit No.      Description
99.1 
104Cover Page Interactive Data File (the cover page tags are embedded within the Inline XBRL document).


2


SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
 
  AFFILIATED MANAGERS GROUP, INC.
Date: July 28, 2021  By:   /s/ David M. Billings
   Name:    David M. Billings
   Title: General Counsel and Secretary


3



amglogoa78.jpg
Exhibit 99.1
Investor Relations:
Media Relations:
  Anjali Aggarwal
Ann Imes
+1 (617) 747-3300
ir@amg.com
pr@amg.com



  
AMG Reports Financial and Operating Results
for the Second Quarter and First Half of 2021
    
Company reports EPS of $2.55, Economic EPS of $4.03 in the second quarter of 2021
image5a.jpg
Announced partnership with Parnassus Investments, the largest independent ESG-dedicated fund manager in the industry
image5a.jpg
Completed strategic evolution of U.S. wealth distribution platform, benefiting clients through differentiated strategies, lower fees
image5a.jpg
Net income (controlling interest) of $109 million, Economic Net Income of $171 million
image5a.jpg
Adjusted EBITDA of $227 million, grew 40% year-over-year, primarily driven by Affiliate investment performance
image5a.jpg
Issued $200 million 40-year hybrid bond, enhancing balance sheet and capital flexibility; repurchased $80 million in common stock

WEST PALM BEACH, FL, July 28, 2021 — Affiliated Managers Group, Inc. (NYSE: AMG) today reported its financial and operating results for the second quarter and six months ended June 30, 2021.

Jay C. Horgen, President and Chief Executive Officer of AMG, said:
“AMG reported growth of 40% in Adjusted EBITDA and 47% in Economic earnings per share relative to the year-ago quarter, driven by the consistent execution of our strategy and the quality and diversity of our growing Affiliate partner group. Net client cash flows were positive in the quarter, excluding certain quantitative strategies, and reflected ongoing strength in private markets, specialty fixed income, ESG, and U.S. equity strategies. AMG’s forward business momentum continues to accelerate as our existing Affiliates deliver excellent investment performance and as we invest in new Affiliates operating in areas of secular growth.

“Recently, we announced a partnership with Parnassus Investments, the largest independent ESG-dedicated fund manager in the industry with over three decades of outstanding performance, enhancing our strategic participation in this fast-growing area. With the addition of Parnassus, AMG Affiliates will now manage over $80 billion in AUM in dedicated ESG strategies and over $600 billion in strategies integrating ESG factors into the investment process. Since the beginning of 2019, we have partnered with seven new Affiliates, reflecting our focus in executing on our new investment opportunity set, and looking ahead, we see an attractive ongoing opportunity to establish new partnerships, given the favorable transaction environment, AMG's strong competitive position, and the increasing demand for our partnership solutions from the highest-quality independent firms around the world.

“During the quarter, we completed the strategic evolution of our U.S. wealth distribution platform, which now offers clients greater access to higher-quality, more-differentiated strategies at lower fees. Going forward, we will continue to invest in growth initiatives alongside our Affiliate partners to meet their strategic objectives. With our strong financial profile and free cash flow generation, we see tremendous opportunity to further build on our momentum through the continued execution of our strategy to drive top-line EBITDA growth, which, together with capital return through share repurchases, will further compound earnings growth and create meaningful shareholder value over time."

FINANCIAL HIGHLIGHTSThree Months EndedSix Months Ended
(in millions, except as noted and per share data)6/30/20206/30/20216/30/20206/30/2021
Operating Performance Measures
AUM (at period end, in billions)$638.4 $755.7 $638.4 $755.7 
Average AUM (in billions)635.7 752.1 649.4 742.8 
Net client cash flows (in billions)(18.2)(8.1)(32.0)(15.6)
Aggregate fees960.9 1,185.6 2,214.0 2,600.0 
Financial Performance Measures
Net income (controlling interest)$30.7 $109.0 $15.1 $258.9 
Earnings per share (diluted) (1)
0.65 2.55 0.32 5.96 
Supplemental Performance Measures (2)
Adjusted EBITDA (controlling interest)$162.1 $227.3 $362.4 $474.1 
Economic net income (controlling interest)129.6 171.2 280.9 356.0 
Economic earnings per share2.74 4.03 5.90 8.30 
For additional information on our Supplemental Performance Measures, including reconciliations to GAAP, see the Financial Tables and Notes.
- 1 -




Capital Management
During the second quarter of 2021, the Company repurchased approximately $80 million in common stock bringing total share repurchases to $290 million year-to-date, and announced a second-quarter cash dividend of $0.01 per share of common stock, payable August 20, 2021 to stockholders of record as of the close of business on August 6, 2021. On July 13, the Company issued a $200 million 40-year hybrid bond.

About AMG
AMG is a leading partner to independent active investment management firms globally. AMG’s strategy is to generate long‐term value by investing in a diverse array of excellent partner-owned investment firms, referred to as "Affiliates," through a proven partnership approach, and allocating resources across the Company's unique opportunity set to the areas of highest growth and return. AMG’s innovative partnership approach enables each Affiliate’s management team to own significant equity in their firm while maintaining operational and investment autonomy. In addition, AMG offers its Affiliates growth capital, global distribution, and other strategic value-added capabilities, which enhance the long-term growth of these independent businesses and enable them to align equity incentives across generations of principals to build enduring franchises. As of June 30, 2021, AMG’s aggregate assets under management were approximately $756 billion across a broad range of active, return-oriented strategies. For more information, please visit the Company’s website at www.amg.com.
Conference Call, Replay and Presentation Information
A conference call will be held with AMG’s management at 8:30 a.m. Eastern time today. Parties interested in listening to the conference call should dial 1-877-407-8291 (U.S. calls) or 1-201-689-8345 (non-U.S. calls) shortly before the call begins.

The conference call will also be available for replay beginning approximately one hour after the conclusion of the call. To hear a replay of the call, please dial 1-877-660-6853 (U.S. calls) or 1-201-612-7415 (non-U.S. calls) and provide conference ID 13721463. The live call and replay of the session and a presentation highlighting the Company's performance can also be accessed via AMG’s website at https://ir.amg.com/.

Financial Tables Follow

- 2 -



ASSETS UNDER MANAGEMENT - STATEMENT OF CHANGES (in billions)
BY STRATEGY - QUARTER TO DATEAlternativesGlobal EquitiesU.S. EquitiesMulti-Asset &
Fixed Income
Total
AUM, March 31, 2021$222.8 $284.7 $110.7 $119.8 $738.0 
Client cash inflows and commitments9.1 10.3 7.7 6.5 33.6 
Client cash outflows(5.1)(21.7)(9.1)(5.8)(41.7)
Net client cash flows4.0 (11.4)(1.4)0.7 (8.1)
New investments2.6 — — — 2.6 
Market changes4.6 17.3 6.1 4.6 32.6 
Foreign exchange0.2 0.7 0.1 0.2 1.2 
Realizations and distributions (net)(9.1)(0.1)— — (9.2)
Other (1.4)(0.1)— 0.1 (1.4)
AUM, June 30, 2021$223.7 $291.1 $115.5 $125.4 $755.7 
BY STRATEGY - YEAR TO DATEAlternativesGlobal EquitiesU.S. EquitiesMulti-Asset &
Fixed Income
Total
AUM, December 31, 2020$216.5 $278.5 $103.5 $117.7 $716.2 
Client cash inflows and commitments17.5 19.5 14.3 13.2 64.5 
Client cash outflows(11.3)(38.8)(16.9)(13.1)(80.1)
Net client cash flows6.2 (19.3)(2.6)0.1 (15.6)
New investments2.6 2.9 1.1 — 6.6 
Market changes8.9 27.8 13.1 7.2 57.0 
Foreign exchange0.4 1.4 0.3 0.4 2.5 
Realizations and distributions (net)(9.5)(0.1)— — (9.6)
Other (1.4)(0.1)0.1 — (1.4)
AUM, June 30, 2021$223.7 $291.1 $115.5 $125.4 $755.7 
BY CLIENT TYPE - QUARTER TO DATEInstitutionalRetailHigh Net
Worth
Total
AUM, March 31, 2021$408.9 $196.8 $132.3 $738.0 
Client cash inflows and commitments12.4 15.2 6.0 33.6 
Client cash outflows(21.4)(15.0)(5.3)(41.7)
Net client cash flows(9.0)0.2 0.7 (8.1)
New investments2.3 — 0.3 2.6 
Market changes16.6 10.4 5.6 32.6 
Foreign exchange0.6 0.5 0.1 1.2 
Realizations and distributions (net)(8.8)(0.2)(0.2)(9.2)
Other (1.0)(0.2)(0.2)(1.4)
AUM, June 30, 2021$409.6 $207.5 $138.6 $755.7 
BY CLIENT TYPE - YEAR TO DATEInstitutionalRetailHigh Net
Worth
Total
AUM, December 31, 2020$401.0 $189.3 $125.9 $716.2 
Client cash inflows and commitments21.6 29.7 13.2 64.5 
Client cash outflows(36.9)(32.3)(10.9)(80.1)
Net client cash flows(15.3)(2.6)2.3 (15.6)
New investments4.5 1.0 1.1 6.6 
Market changes28.7 18.8 9.5 57.0 
Foreign exchange1.4 0.9 0.2 2.5 
Realizations and distributions (net)(9.2)(0.1)(0.3)(9.6)
Other (1.5)0.2 (0.1)(1.4)
AUM, June 30, 2021$409.6 $207.5 $138.6 $755.7 


- 3 -



CONSOLIDATED STATEMENTS OF INCOME
Three Months Ended
(in millions, except per share data)6/30/20206/30/2021
Consolidated revenue$471.1 $586.3 
Consolidated expenses:
Compensation and related expenses216.5 248.9 
Selling, general and administrative73.6 88.6 
Intangible amortization and impairments80.9 8.9 
Interest expense22.3 26.8 
Depreciation and other amortization5.0 4.1 
Other expenses (net)11.3 12.6 
Total consolidated expenses409.6 389.9 
Equity method income (net)(3)
17.4 37.6 
Investment and other income (expense)(12.1)21.1 
Income before income taxes66.8 255.1 
Income tax expense 3.3 70.9 
Net income63.5 184.2 
Net income (non-controlling interests)(32.8)(75.2)
Net income (controlling interest)$30.7 $109.0 
Average shares outstanding (basic)47.2 41.6 
Average shares outstanding (diluted)47.3 44.6 
Earnings per share (basic)$0.65 $2.62 
Earnings per share (diluted)(1)
$0.65 $2.55 
RECONCILIATIONS OF SUPPLEMENTAL PERFORMANCE MEASURES(2)
Three Months Ended
(in millions, except per share data)6/30/20206/30/2021
Net income (controlling interest)$30.7 $109.0 
Intangible amortization and impairments86.3 35.6 
Intangible-related deferred taxes (3.1)31.0 
Other economic items15.7 (4.4)
Economic net income (controlling interest)$129.6 $171.2 
Average shares outstanding (adjusted diluted) 47.3 42.5 
Economic earnings per share$2.74 $4.03 
Net income (controlling interest)$30.7 $109.0 
Interest expense22.3 26.8 
Income taxes1.1 62.2 
Intangible amortization and impairments86.3 35.6 
Other items21.7 (6.3)
Adjusted EBITDA (controlling interest)$162.1 $227.3 

See Notes for additional information.

- 4 -



CONSOLIDATED STATEMENTS OF INCOME
Six Months Ended
(in millions, except per share data)6/30/20206/30/2021
Consolidated revenue$978.3 $1,145.4 
Consolidated expenses:
Compensation and related expenses424.4 495.8 
Selling, general and administrative163.8 167.4 
Intangible amortization and impairments101.5 16.4 
Interest expense41.8 54.3 
Depreciation and other amortization10.1 8.4 
Other expenses (net)22.3 26.1 
Total consolidated expenses763.9 768.4 
Equity method income (loss) (net)(3)
(95.8)89.2 
Investment and other income (expense)(9.7)53.5 
Income before income taxes108.9 519.7 
Income tax expense5.5 121.5 
Net income103.4 398.2 
Net income (non-controlling interests)(88.3)(139.3)
Net income (controlling interest)$15.1 $258.9 
Average shares outstanding (basic)47.5 42.1 
Average shares outstanding (diluted)47.6 45.0 
Earnings per share (basic)$0.32 $6.15 
Earnings per share (diluted)(1)
$0.32 $5.96 
RECONCILIATIONS OF SUPPLEMENTAL PERFORMANCE MEASURES(2)
Six Months Ended
(in millions, except per share data)6/30/20206/30/2021
Net income (controlling interest)$15.1 $258.9 
Intangible amortization and impairments282.0 76.1 
Intangible-related deferred taxes (34.1)39.9 
Other economic items17.9 (18.9)
Economic net income (controlling interest)$280.9 $356.0 
Average shares outstanding (adjusted diluted) 47.6 42.9 
Economic earnings per share$5.90 $8.30 
Net income (controlling interest)$15.1 $258.9 
Interest expense41.8 54.3 
Income taxes1.2 110.6 
Intangible amortization and impairments282.0 76.1 
Other items22.3 (25.8)
Adjusted EBITDA (controlling interest)$362.4 $474.1 

See Notes for additional information

- 5 -



CONSOLIDATED BALANCE SHEET
Period Ended
(in millions)12/31/20206/30/2021
Assets
Cash and cash equivalents$1,039.7 $777.9 
Receivables421.6 711.8 
Investments in marketable securities74.9 62.8 
Goodwill2,661.4 2,669.7 
Acquired client relationships (net)1,048.8 1,036.8 
Equity method investments in Affiliates (net)2,074.8 2,119.1 
Fixed assets (net)79.6 75.8 
Other investments257.2 312.1 
Other assets230.9 255.7 
Total assets$7,888.9 $8,021.7 
Liabilities and Equity
Payables and accrued liabilities$712.4 $843.5 
Debt2,312.1 2,299.3 
Deferred income tax liability (net)423.4 497.1 
Other liabilities452.2 468.2 
Total liabilities3,900.1 4,108.1 
Redeemable non-controlling interests671.5 755.7 
Equity:
Common stock0.6 0.6 
Additional paid-in capital728.9 539.3 
Accumulated other comprehensive loss(98.3)(64.8)
Retained earnings4,005.5 4,263.4 
4,636.7 4,738.5 
Less: treasury stock, at cost(1,857.0)(2,128.9)
Total stockholders’ equity2,779.7 2,609.6 
Non-controlling interests537.6 548.3 
Total equity3,317.3 3,157.9 
Total liabilities and equity$7,888.9 $8,021.7 


- 6 -



Notes

(1)    Earnings per share (diluted) adjusts for the dilutive effect of the potential issuance of incremental shares of our common stock. We had junior convertible securities outstanding during the periods presented and are required to apply the if-converted method to these securities in our calculation of Earnings per share (diluted). Under the if-converted method, shares that are issuable upon conversion are deemed outstanding, regardless of whether the securities are contractually convertible into our common stock at that time. For this calculation, the interest expense (net of tax) attributable to these dilutive securities is added back to Net income (controlling interest), reflecting the assumption that the securities have been converted. Issuable shares for these securities and related interest expense are excluded from the calculation if an assumed conversion would be anti-dilutive to diluted earnings per share.

The following table provides a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share:
Three Months Ended Six Months Ended
(in millions)6/30/20206/30/20216/30/20206/30/2021
Numerator
Net income (controlling interest)$30.7 $109.0 $15.1 $258.9 
Interest expense on junior convertible securities, net of taxes— 4.6 — 9.4 
Net income (controlling interest), as adjusted$30.7 $113.6 $15.1 $268.3 
Denominator
Average shares outstanding (basic)47.2 41.6 47.5 42.1 
Effect of dilutive instruments:
Stock options and restricted stock units0.1 0.9 0.1 0.8 
Junior convertible securities— 2.1 — 2.1 
Average shares outstanding (diluted)47.3 44.6 47.6 45.0 

(2)    As supplemental information, we provide non-GAAP performance measures of Adjusted EBITDA (controlling interest), Economic net income (controlling interest) and Economic earnings per share. Management utilizes these non-GAAP performance measures to assess our performance before our share of certain non-cash expenses and to improve comparability between periods.

Adjusted EBITDA (controlling interest) represents our performance before our share of interest expense, income taxes, depreciation, amortization, impairments, certain Affiliate equity expenses, gains and losses on general partner and seed capital investments, and adjustments to our contingent payment arrangements. We believe that many investors use this non-GAAP measure when assessing the financial performance of companies in the investment management industry.

Under our Economic net income (controlling interest) definition, we add to Net income (controlling interest) our share of pre-tax intangible amortization and impairments (including the portion attributable to equity method investments in Affiliates), deferred taxes related to intangible assets, and other economic items which include non-cash imputed interest (principally related to the accounting for convertible securities and contingent payment arrangements), certain Affiliate equity expenses, and gains and losses on general partner and seed capital investments. Economic net income (controlling interest) is used by management and our Board of Directors as our principal performance benchmark, including as one of the measures for aligning executive compensation with stockholder value.

Economic earnings per share represents Economic net income (controlling interest) divided by the Average shares outstanding (adjusted diluted). In this calculation, the potential share issuance in connection with our junior convertible securities is measured using a “treasury stock” method. Under this method, only the net number of shares of common stock equal to the value of the junior convertible securities in excess of par, if any, are deemed to be outstanding. We believe the inclusion of net shares under a treasury stock method best reflects the benefit of the increase in available capital resources (which could be used to repurchase shares of common stock) that occurs when these securities are converted and we are relieved of our debt obligation.

The following table provides a reconciliation of Average shares outstanding (adjusted diluted):
Three Months Ended Six Months Ended
(in millions)6/30/20206/30/20216/30/20206/30/2021
Average shares outstanding (diluted)47.3 44.6 47.6 45.0 
Junior convertible securities — (2.1)— (2.1)
Average shares outstanding (adjusted diluted)47.3 42.5 47.6 42.9 

These non-GAAP performance measures are provided in addition to, but not as a substitute for, Net income (controlling interest), Earnings per share or other GAAP performance measures. For additional information on our non-GAAP measures, see our Annual and Quarterly Reports on Form 10-K and 10-Q, respectively, which are accessible on the SEC’s website at www.sec.gov.




- 7 -



Notes (continued)

(3)    The following table presents equity method earnings and equity method intangible amortization and impairments, which in aggregate form Equity method income (loss) (net):
Three Months EndedSix Months Ended
(in millions)6/30/20206/30/20216/30/20206/30/2021
Equity method earnings$54.3 $66.9 $120.4 $153.7 
Equity method intangible amortization and impairments(36.9)(29.3)(216.2)(64.5)
Equity method income (loss) (net)$17.4 $37.6 $(95.8)$89.2 

Forward Looking Statements and Other Matters
Certain matters discussed in this press release may constitute forward-looking statements within the meaning of the federal securities laws. These statements include, but are not limited to, statements related to our expectations regarding the performance of our business, our financial results, our liquidity and capital resources and other non-historical statements. You can identify these forward-looking statements by the use of words such as “outlook,” “guidance,” “believes,” “expects,” “potential,” "preliminary," “continues,” “may,” “will,” “should,” “seeks,” “approximately,” “predicts,” “projects,” “positioned,” “prospects,” “intends,” “plans,” “estimates,” “pending investments,” “anticipates” or the negative version of these words or other comparable words. Actual results and the timing of certain events could differ materially from those projected in or contemplated by the forward-looking statements due to a number of factors, including changes in the securities or financial markets or in general economic conditions, pandemics (including COVID-19) and related changes in the global economy, capital markets and the asset management industry, the availability of equity and debt financing, competition for acquisitions of interests in investment management firms, the ability to close pending investments, the investment performance and growth rates of our Affiliates and their ability to effectively market their investment strategies, the mix of Affiliate contributions to our earnings and other risks, uncertainties and assumptions, including those described under the section entitled “Risk Factors” in our most recent Annual Report on Form 10-K and Quarterly Reports on Form 10-Q. Such factors may be updated from time to time in our periodic filings with the SEC. These factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in this release and in our filings with the SEC. We undertake no obligation to publicly update or review any forward-looking statements, whether as a result of new information, future developments or otherwise, except as required by applicable law.

From time to time, AMG may use its website as a distribution channel of material Company information. AMG routinely posts financial and other important information regarding the Company in the Investor Relations section of its website at www.amg.com and encourages investors to consult that section regularly.
- 8 -



v3.21.2
Cover page
Jul. 28, 2021
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jul. 28, 2021
Entity Registrant Name AFFILIATED MANAGERS GROUP, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 001-13459
Entity Tax Identification Number 04-3218510
Entity Address, Address Line One 777 South Flagler Drive
Entity Address, City or Town West Palm Beach
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33401
City Area Code 800
Local Phone Number 345-1100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001004434
Amendment Flag false
Common Stock ($0.01 par value)  
Entity Information [Line Items]  
Title of 12(b) Security Common Stock ($0.01 par value)
Trading Symbol AMG
Security Exchange Name NYSE
5.875% Junior Subordinated Notes due 2059  
Entity Information [Line Items]  
Title of 12(b) Security 5.875% Junior Subordinated Notes due 2059
Trading Symbol MGR
Security Exchange Name NYSE
Four Point Seventy Five Junior Subordinated Notes Due 2060  
Entity Information [Line Items]  
Title of 12(b) Security 4.750% Junior Subordinated Notes due 2060
Trading Symbol MGRB
Security Exchange Name NYSE
Four Point Two Junior Subordinated Notes Due 2061  
Entity Information [Line Items]  
Title of 12(b) Security 4.200% Junior Subordinated Notes due 2061
Trading Symbol MGRD
Security Exchange Name NYSE


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