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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Affiliate Partners |  |  |
Related Party Transactions |  |  |
Distributions paid to Affiliate management owners | $ 569.4 amg_RelatedPartyTransactionDistributiontoNoncontrollingInterests / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 267.1 amg_RelatedPartyTransactionDistributiontoNoncontrollingInterests / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 181.4 amg_RelatedPartyTransactionDistributiontoNoncontrollingInterests / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Amount paid for affiliate equity interest repurchases | 32.6 amg_RelatedPartyTransactionAmountPaidforEquityInterests / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 36.9 amg_RelatedPartyTransactionAmountPaidforEquityInterests / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 8.0 amg_RelatedPartyTransactionAmountPaidforEquityInterests / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Amount received for affiliate equity issuances | 11.0 amg_RelatedPartyTransactionsAmountReceivedforEquityIssuances / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 2.5 amg_RelatedPartyTransactionsAmountReceivedforEquityIssuances / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 3.3 amg_RelatedPartyTransactionsAmountReceivedforEquityIssuances / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Affiliate Partners | Other Assets |  |  |
Related Party Transactions |  |  |
Receivables from related parties | 20.8 us-gaap_DueFromRelatedParties / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 21.8 us-gaap_DueFromRelatedParties / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |
Notes receivable from related parties | 9.7 us-gaap_NotesReceivableRelatedParties / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 6.9 us-gaap_NotesReceivableRelatedParties / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 7.1 us-gaap_NotesReceivableRelatedParties / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Affiliate Partners | Other Liabilities |  |  |
Related Party Transactions |  |  |
Payable to related parties | 88.6 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 56.8 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |
Notes payable to related parties | 4.4 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 5.5 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 23.3 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Prior Owner | Other Liabilities |  |  |
Related Party Transactions |  |  |
Investment partnerships with prior owners | 71.6 amg_InvestmentPartnershipswithPriorOwners / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amg_PriorOwnerMember | 72.9 amg_InvestmentPartnershipswithPriorOwners / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amg_PriorOwnerMember |
Prior Owner | Non-Controlling Interests |  |  |
Related Party Transactions |  |  |
Investment partnerships with prior owners | $ 13.5 amg_InvestmentPartnershipswithPriorOwners / us-gaap_BalanceSheetLocationAxis = us-gaap_NoncontrollingInterestMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amg_PriorOwnerMember | $ 22.2 amg_InvestmentPartnershipswithPriorOwners / us-gaap_BalanceSheetLocationAxis = us-gaap_NoncontrollingInterestMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amg_PriorOwnerMember |

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- Definition For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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