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Business Combinations - Schedule of Purchase Price Allocation for Investments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition |  |  |
Goodwill | $ 2,652.8 us-gaap_Goodwill | $ 2,341.7 us-gaap_Goodwill | $ 2,355.2 us-gaap_Goodwill
SouthernSun |  |  |
Business Acquisition |  |  |
Consideration paid | 109.9 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Non-controlling interests | 74.0 us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Enterprise value | 183.9 amg_BusinessAcquisitionEnterpriseValue / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Acquired client relationships | 125.3 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Deferred income taxes | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Tangible assets, net | 6.3 amg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredTangibleAssets / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Goodwill | 52.3 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
Total | 183.9 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = amg_SouthernSunMember |  |
River Road |  |  |
Business Acquisition |  |  |
Consideration paid | 132.4 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Non-controlling interests | 35.8 us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Enterprise value | 168.2 amg_BusinessAcquisitionEnterpriseValue / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Acquired client relationships | 64.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Deferred income taxes | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Tangible assets, net | 4.5 amg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredTangibleAssets / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Goodwill | 99.6 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Total | 168.2 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = amg_RiverRoadMember |  |
Veritas |  |  |
Business Acquisition |  |  |
Consideration paid | 319.9 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Non-controlling interests | 125.2 us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Enterprise value | 445.1 amg_BusinessAcquisitionEnterpriseValue / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Acquired client relationships | 275.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Deferred income taxes | (35.7)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Tangible assets, net | 12.6 amg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredTangibleAssets / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Goodwill | 192.6 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |
Total | $ 445.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = amg_VeritasMember |  |

X
- Definition Represents the amount of Consideration Paid, Deferred Consideration, noncontrolling interest and Contingent payment obligations related to acquisition. + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired, Tangible Assets + References No definition available. + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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