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Borrowings - Outstanding Loans Payable of Consolidated Funds (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding $ 5,715.8 $ 5,890.0
Loans Payable of Consolidated Funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding 5,725.1 5,903.0
Fair Value 5,682.0 5,811.0
Senior secured notes    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding 5,519.6 5,585.4
Fair Value $ 5,470.1 $ 5,561.1
Weighted Average Interest Rate 1.72% 1.68%
Weighted Average Remaining Maturity in Years 10 years 2 months 23 days 10 years 3 months
Subordinated notes, preferred shares and other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Borrowing Outstanding $ 205.5 $ 317.6
Fair Value $ 211.9 $ 249.9
Weighted Average Remaining Maturity in Years 10 years 5 months 4 days 10 years 4 months 28 days