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Borrowings - Debt Obligations (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2021
May 31, 2021
Debt Instrument [Line Items]        
Borrowing Outstanding $ 2,300,000,000 $ 2,296,700,000    
Carrying Value 2,275,500,000 2,271,700,000    
CLO Borrowings        
Debt Instrument [Line Items]        
Borrowing Outstanding 425,000,000.0 421,700,000    
Carrying Value $ 421,300,000 418,100,000    
3.500% Senior Notes Due 9/19/2029        
Debt Instrument [Line Items]        
Interest rate (percent) 3.50%      
Borrowing Outstanding $ 425,000,000.0 425,000,000.0    
Carrying Value $ 422,300,000 422,000,000.0    
5.625% Senior Notes Due 3/30/2043        
Debt Instrument [Line Items]        
Interest rate (percent) 5.625%      
Borrowing Outstanding $ 600,000,000.0 600,000,000.0    
Carrying Value $ 600,600,000 600,600,000    
5.650% Senior Notes Due 9/15/2048        
Debt Instrument [Line Items]        
Interest rate (percent) 5.65%      
Borrowing Outstanding $ 350,000,000.0 350,000,000.0    
Carrying Value $ 346,300,000 346,300,000    
4.625% Subordinated Notes Due 5/15/2061        
Debt Instrument [Line Items]        
Interest rate (percent) 4.625%     4.625%
Borrowing Outstanding $ 500,000,000.0 500,000,000.0 $ 65,000,000 $ 435,000,000
Carrying Value $ 485,000,000.0 $ 484,700,000