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Accounting Standards and Policies (Policies)	3 Months Ended
	Mar. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	The Consolidated Financial Statements of Affiliated Managers Group, Inc. (the “Company”) have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for full year financial statements. In the opinion of management, all normal and recurring adjustments considered necessary for a fair statement of the Company’s interim financial position and results of operations have been included and all intercompany balances and transactions have been eliminated. Certain reclassifications have been made to the prior period’s financial statements to conform to the current period’s presentation. Operating results for interim periods are not necessarily indicative of the results that may be expected for any other period or for the full year. The Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 includes additional information about its operations, financial position, and accounting policies, and should be read in conjunction with this Quarterly Report on Form 10-Q.All amounts in these notes, except per share data in the text and tables herein, are stated in millions unless otherwise indicated
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in the financial statements. Actual results could differ from those estimates.
Recently Adopted Accounting Standards	Recently Adopted Accounting StandardsEffective January 1, 2022, the Company adopted Accounting Standard Update (“ASU”) 2020-06, Debt with Conversion and Other Options and Derivatives and Hedging - Contracts in Entity’s Own Equity using a modified retrospective method. ASU 2020-06 removes the separate liability and equity accounting for the Company’s junior convertible securities. Consequently, the Company’s junior convertible securities are accounted for wholly as debt and are carried at their face value less unamortized debt issuance costs. The adoption resulted in increases in Debt and beginning Retained earnings of $101.5 million and $4.5 million, respectively, and decreases in Additional paid-in-capital and Deferred income tax liability (net) of $80.6 million and $25.4 million, respectively. As a result of the adoption of ASU 2020-06, the Company also updated its Earnings Per Share accounting policy as described below.
Earnings Per Share	Earnings Per Share The calculation of Earnings per share (basic) is based on the weighted average number of shares of the Company’s common stock outstanding during the period. Earnings per share (diluted) is similar to Earnings per share (basic), but adjusts for the dilutive effect of the potential issuance of incremental shares of the Company’s common stock. The Company had share-based compensation awards outstanding during the periods presented with vesting provisions subject to certain performance conditions. These awards are excluded from the calculation of Earnings per share (diluted) if the performance condition has not been met as of the end of the reporting period. The Company has agreements with Affiliate equity holders that provide the Company a conditional right to call and holders a conditional right to put their interests to the Company at certain intervals. These arrangements are presented at their current redemption value as Redeemable non-controlling interests. The Company may settle these interests in cash or, subject to the terms of the applicable agreement, shares of its common stock, or other forms of consideration, at its option. Prior to 2022, the Company excluded any potential dilutive effect from possible share settlements of Redeemable non-controlling interests as the Company currently intends to settle in cash. Upon adoption of ASU 2020-06, the Company must assume the settlement of all of its Redeemable non-controlling interests using the maximum number of shares permitted under its arrangements. Purchases are assumed to occur at the beginning of the reporting period. The Company acquires the rights to the underlying Affiliate equity when purchased, and therefore, the earnings that would be acquired (net of tax) are assumed to increase Net income (controlling interest) in the computation of Earnings per share (diluted). The issuance of shares and the related income acquired are excluded from the calculation if an assumed purchase of Redeemable non-controlling interests would be anti-dilutive to diluted earnings per share. The Company had junior convertible securities outstanding during the periods presented and is required to apply the if-converted method to these securities in its 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 the Company’s 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.
Investments in Affiliates and Affiliate Sponsored Investments Products	Affiliate Sponsored Investment Products The Company’s Affiliates sponsor various investment products where the Affiliate also acts as the investment adviser. These investment products are typically owned primarily by third-party investors; however, certain products are funded with general partner and seed capital investments from the Company and its Affiliates. Third-party investors in Affiliate sponsored investment products are generally entitled to substantially all of the economics of these products, except for the asset- and performance-based fees earned by the Company’s Affiliates or any gains or losses attributable to the Company’s or its Affiliates’ investments in these products. As a result, the Company generally does not consolidate these products. However, for certain products, the Company’s consolidated Affiliates, as the investment manager, have the power to direct the activities of the investment product and have an exposure to the economics of the VIE that is more than insignificant, though generally only for a short period while the product is established and has yet to attract significant other investors. When the products are consolidated, the Company retains the specialized investment company accounting principles of the underlying products, and all of the underlying investments are carried at fair value in Investments in marketable securities in the Consolidated Balance Sheets, with corresponding changes in the investments’ fair values included in Investment and other income. Purchases and sales of securities are presented within purchases and sales by consolidated Affiliate sponsored investment products in the Consolidated Statements of Cash Flows, respectively, and the third-party investors’ interests are recorded in Redeemable non-controlling interests. When the Company or its consolidated Affiliates no longer control these products, due to a reduction in ownership or other reasons, the products are deconsolidated with only the Company’s or its consolidated Affiliate’s investment in the product reported from the date of deconsolidation.The Company’s carrying value, and maximum exposure to loss from unconsolidated Affiliate sponsored investment products, is its or its consolidated Affiliates’ interests in the unconsolidated net assets of the respective products.

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