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Fixed Assets and Lease Commitments - Schedule of Fixed Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fixed assets |  |
Fixed assets, at cost | $ 199.4 us-gaap_PropertyPlantAndEquipmentGross | $ 179.9 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization | (104.0)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (87.6)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Fixed assets, net | 95.4 us-gaap_PropertyPlantAndEquipmentNet | 92.3 us-gaap_PropertyPlantAndEquipmentNet
Building and Leasehold Improvements |  |
Fixed assets |  |
Fixed assets, at cost | 84.1 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = amg_BuildingAndLeaseholdImprovementsMember | 78.5 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = amg_BuildingAndLeaseholdImprovementsMember
Equipment |  |
Fixed assets |  |
Fixed assets, at cost | 38.3 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember | 36.5 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember
Furniture and Fixtures |  |
Fixed assets |  |
Fixed assets, at cost | 17.5 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | 15.4 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Land and Improvements |  |
Fixed assets |  |
Fixed assets, at cost | 18.7 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember | 18.9 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember
Software |  |
Fixed assets |  |
Fixed assets, at cost | $ 40.8 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember | $ 30.6 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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