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Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [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 United States of America (“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 complete financial statements. In the opinion of management, all adjustments considered necessary for a fair statement of the results have been included. 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, 2014 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.
Recent Accounting Developments	In February 2015, the Financial Accounting Standard Board (the “FASB”) issued a new standard that amended the current consolidation guidance. The new standard changes the analysis required to determine whether an entity is a variable interest entity and should be consolidated. The new standard is effective for interim and fiscal periods beginning after December 15, 2015. The Company is evaluating the impact of this new standard on its Consolidated Financial Statements. In April 2015, the FASB issued a new standard to reduce diversity in the presentation of debt issuance costs. The new standard requires debt issuance costs to be presented on the balance sheet as a deduction from the related debt. The new standard is effective for interim and fiscal periods beginning after December 15, 2015. The Company does not anticipate that this new standard will have a material impact on its Consolidated Financial Statements. In April 2015, the FASB issued a new standard amending the disclosure requirements for investments in certain entities that calculate net asset value per share. The new standard removes, from the fair value hierarchy, investments for which the net asset value is used as a practical measure of fair value. The new standard is effective for interim and fiscal periods beginning after December 15, 2015. The Company is evaluating the impact of this new standard on its financial statement disclosures. In September 2015, the FASB issued a new standard requiring an acquirer to recognize and disclose adjustments to provisional purchase price allocations, performed in connection with business combinations, in the reporting period that the adjustments are determined. The new standard is effective for interim and fiscal periods beginning after December 15, 2015. The Company is evaluating the impact of this new standard on its Consolidated Financial Statements.