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Consolidated Investment Entities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Investments $ 88,891.4 $ 87,050.8
Consolidated investment entities
    
Variable Interest Entity [Line Items]    
Investments 656.2 654.0
Consolidated collateral loan obligations 13 12
Consolidated funds 35 35
Assets of consolidated investment entities 9,551.5 8,999.4
Liabilities of consolidated investment entities 6,493.0 6,064.9
Consolidated investment entities | VOEs
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 3,477.5 3,308.5
Liabilities of consolidated investment entities 478.1 435.3
Consolidated investment entities | VOEs | Cash and Cash Equivalents
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 71.4 68.2
Consolidated investment entities | VOEs | Limited Partnerships/Corporations
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 3,382.4 3,218.6
Consolidated investment entities | VOEs | Other assets
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 23.7 21.7
Consolidated investment entities | VOEs | Other Liabilities
    
Variable Interest Entity [Line Items]    
Liabilities of consolidated investment entities 478.1 435.3
Consolidated investment entities | VIEs
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 6,074.0 5,690.9
Liabilities of consolidated investment entities 6,014.9 5,629.6
Consolidated investment entities | VIEs | Cash and Cash Equivalents
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 498.6 642.5
Consolidated investment entities | VIEs | Corporate Loans
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 5,490.7 4,965.3
Consolidated investment entities | VIEs | Other assets
    
Variable Interest Entity [Line Items]    
Assets of consolidated investment entities 84.7 83.1
Consolidated investment entities | VIEs | Collateralized Debt Obligations
    
Variable Interest Entity [Line Items]    
Liabilities of consolidated investment entities 5,525.5 5,161.6
Consolidated investment entities | VIEs | Other Liabilities
    
Variable Interest Entity [Line Items]    
Liabilities of consolidated investment entities $ 489.4 $ 468.0