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Equity Method Investments in Affiliates - Schedule of Financial Information for Affiliates Accounted for Under the Equity Method (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]      
Revenue $ 1,869.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue [1] $ 1,589.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue [1] $ 1,005.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue [1]
Net income 253.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 1,321.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 783.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Assets 34,729.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets [2] 19,139.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets [2]  
Liabilities and Non-controlling interest $ 33,048.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities [2] $ 17,763.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities [2]  
[1] Revenue includes advisory fees for asset management services and net investment income from consolidated investment partnerships.
[2] Assets consist primarily of investment securities in consolidated investment partnerships. These partnerships are generally held by investors that are unrelated to the Company.