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Borrowings - Additional Information (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
EUR (€)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Feb. 28, 2017
EUR (€)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Line of Credit Facility [Line Items]                  
Interest $ 121,000,000.0 $ 123,800,000 $ 110,400,000            
Debt principal amount 2,164,400,000 2,306,700,000              
Fair value of CLO assets $ 7,900,000,000 6,800,000,000              
Senior Notes                  
Line of Credit Facility [Line Items]                  
Debt redemption price percentage 100.00%                
CLO Term Loans                  
Line of Credit Facility [Line Items]                  
Interest $ 24,400,000 24,900,000 10,700,000            
Debt principal amount 289,400,000 431,700,000              
CLO Term Loan February 2017 Maturing September 2029                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 23,500,000           € 22.8    
CLO Term Loan February 2017 Maturing September 2029 | Euribor                  
Line of Credit Facility [Line Items]                  
Interest rate at end of period 6.13%     6.13%          
Master Credit Agreements - Term Loans                  
Line of Credit Facility [Line Items]                  
Outstanding borrowing $ 25,500,000                
CLO Financing Facility                  
Line of Credit Facility [Line Items]                  
Outstanding borrowing 177,100,000     € 171.1          
CBAM CLO Financing Facility                  
Line of Credit Facility [Line Items]                  
Outstanding borrowing 63,300,000     61.2          
Borrowing capacity | €       € 100.0          
5.650% Senior Notes Due 9/15/2048                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 350,000,000.0 350,000,000.0              
Interest rate (percent) 5.65%     5.65%          
5.650% Senior Notes Due 9/15/2048 | Senior Notes                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 350,000,000.0                
Interest rate (percent) 5.65%     5.65%          
Fair Value $ 338,100,000 336,000,000.0              
5.650% Senior Notes Due 9/15/2048 | Treasury Rate | Senior Notes                  
Line of Credit Facility [Line Items]                  
Redemption price, discount rate 0.40%                
5.625% Senior Notes Due 3/30/2043                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 600,000,000.0 600,000,000.0              
Interest rate (percent) 5.625%     5.625%          
5.625% Senior Notes Due 3/30/2043 | Senior Notes                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 600,000,000.0             $ 200,000,000.0 $ 400,000,000.0
Interest rate (percent) 5.625%     5.625%          
Fair Value $ 589,500,000 594,600,000              
5.625% Senior Notes Due 3/30/2043 | Treasury Rate | Senior Notes                  
Line of Credit Facility [Line Items]                  
Redemption price, discount rate 0.40%                
3.500% Senior Notes Due 9/19/2029                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 425,000,000.0 425,000,000.0              
Interest rate (percent) 3.50%     3.50%          
3.500% Senior Notes Due 9/19/2029 | Senior Notes                  
Line of Credit Facility [Line Items]                  
Debt principal amount $ 425,000,000.0                
Interest rate (percent) 3.50%     3.50%          
Fair Value $ 401,200,000 401,900,000              
3.500% Senior Notes Due 9/19/2029 | Treasury Rate | Senior Notes                  
Line of Credit Facility [Line Items]                  
Redemption price, discount rate 0.30%                
4.625% Subordinated Notes Due 5/15/2061                  
Line of Credit Facility [Line Items]                  
Interest $ 23,500,000 23,500,000 $ 23,500,000            
Debt principal amount         $ 65,000,000 $ 435,000,000      
Debt redemption price percentage 102.00%                
Interest rate (percent)           4.625%      
Period from tax redemption event that debt may be redeemed 120 days                
Period from rating agency event that debt may be redeemed 90 days                
Fair Value $ 356,400,000 $ 411,800,000