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Borrowings - Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
May 31, 2021
Debt Instrument [Line Items]      
Borrowing Outstanding $ 2,280.1 $ 2,097.6  
Carrying Value 2,255.0 2,071.6  
CLO Borrowings      
Debt Instrument [Line Items]      
Borrowing Outstanding 405.1 222.6  
Carrying Value $ 402.2 219.0  
5.625% Senior Notes Due 3/30/2043      
Debt Instrument [Line Items]      
Interest rate (percent) 5.625%    
Borrowing Outstanding $ 600.0 600.0  
Carrying Value $ 600.6 600.6  
5.650% Senior Notes Due 9/15/2048      
Debt Instrument [Line Items]      
Interest rate (percent) 5.65%    
Borrowing Outstanding $ 350.0 350.0  
Carrying Value $ 346.2 346.1  
3.500% Senior Notes Due 9/19/2029      
Debt Instrument [Line Items]      
Interest rate (percent) 3.50%    
Borrowing Outstanding $ 425.0 425.0  
Carrying Value $ 421.7 421.6  
4.625% Subordinated Notes Due 5/15/2061      
Debt Instrument [Line Items]      
Interest rate (percent) 4.625%   4.625%
Borrowing Outstanding $ 500.0 500.0  
Carrying Value $ 484.3 $ 484.3