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Borrowings - Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
May 31, 2021
Debt Instrument [Line Items]        
Borrowing Outstanding $ 2,300.4 $ 2,296.7    
Carrying Value 2,275.6 2,271.7    
CLO Borrowings        
Debt Instrument [Line Items]        
Borrowing Outstanding 425.4 421.7    
Carrying Value $ 421.8 418.1    
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 $ 346.3 346.3    
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 $ 422.1 422.0    
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 $ 65.0 $ 435.0
Carrying Value $ 484.8 $ 484.7