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Borrowings - Outstanding Loans Payable of Consolidated Funds (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding $ 3,806.0 $ 3,876.6
Fair Value 3,794.8 3,866.3
Senior secured notes    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding 3,631.2 3,681.0
Fair Value $ 3,621.3 $ 3,672.5
Weighted Average Interest Rate 2.24% 2.45%
Weighted Average Remaining Maturity in Years 11 years 5 months 27 days 10 years 2 months 19 days
Subordinated notes, preferred shares and other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding $ 174.8 $ 195.6
Fair Value $ 173.5 $ 193.8
Weighted Average Remaining Maturity in Years 9 years 9 months 15 days 9 years 3 months 3 days