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Borrowings - Additional Information (Details)
€ in Millions
 1 Months Ended 3 Months Ended
Aug. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
EUR (€)
Dec. 31, 2023
USD ($)
Jul. 31, 2023
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Feb. 28, 2017
EUR (€)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                      
Interest expense   $ 30,800,000 $ 29,700,000                
Borrowings   2,283,100,000     $ 2,306,700,000            
Fair value of collateralized loan obligation assets   $ 7,100,000,000     6,800,000,000            
Senior Notes                      
Debt Instrument [Line Items]                      
Debt redemption price percentage (percent)   100.00%                  
CLO Borrowings                      
Debt Instrument [Line Items]                      
Interest expense   $ 6,800,000 5,200,000                
Borrowings   408,100,000     431,700,000            
CLO Term Loan February 2017 Maturing September 2029                      
Debt Instrument [Line Items]                      
Borrowings   $ 34,200,000             € 31.7    
CLO Term Loan February 2017 Maturing September 2029 | Euribor                      
Debt Instrument [Line Items]                      
Interest rate under credit facility   6.30%   6.30%              
Master Credit Agreements - Term Loans                      
Debt Instrument [Line Items]                      
Outstanding borrowings   $ 79,200,000                  
CLO Financing Facility                      
Debt Instrument [Line Items]                      
Outstanding borrowings   227,700,000   € 211.0              
CBAM CLO Financing Facility                      
Debt Instrument [Line Items]                      
Borrowing capacity | €       100.0              
Outstanding borrowings   66,800,000   € 61.9              
5.650% Senior Notes Due 9/15/2048                      
Debt Instrument [Line Items]                      
Borrowings   $ 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                      
Debt Instrument [Line Items]                      
Borrowings   $ 350,000,000.0                  
Fair value of debt   $ 337,800,000     336,000,000.0            
5.650% Senior Notes Due 9/15/2048 | Treasury rate | Senior Notes                      
Debt Instrument [Line Items]                      
Discount rate, spread on variable rate   0.40%                  
5.625% Senior Notes Due 3/30/2043                      
Debt Instrument [Line Items]                      
Borrowings   $ 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                      
Debt Instrument [Line Items]                      
Borrowings   $ 600,000,000.0               $ 200,000,000 $ 400,000,000
Fair value of debt   $ 588,000,000.0     594,600,000            
5.625% Senior Notes Due 3/30/2043 | Treasury rate | Senior Notes                      
Debt Instrument [Line Items]                      
Discount rate, spread on variable rate   0.40%                  
3.500% Senior Notes Due 9/19/2029                      
Debt Instrument [Line Items]                      
Borrowings   $ 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                      
Debt Instrument [Line Items]                      
Borrowings   $ 425,000,000.0                  
Interest rate (percent)   3.50%   3.50%              
Fair value of debt   $ 393,900,000     401,900,000            
3.500% Senior Notes Due 9/19/2029 | Treasury rate | Senior Notes                      
Debt Instrument [Line Items]                      
Discount rate, spread on variable rate   0.30%                  
4.625% Subordinated Notes Due 5/15/2061                      
Debt Instrument [Line Items]                      
Interest expense   $ 5,900,000 $ 5,900,000                
Borrowings   $ 500,000,000.0     500,000,000.0   $ 65,000,000 $ 435,000,000      
Debt redemption price percentage (percent)   102.00%                  
Interest rate (percent)   4.625%   4.625%       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 of debt   $ 390,200,000     411,800,000            
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Borrowing capacity   $ 1,000,000,000                  
Interest rate under credit facility   6.43%   6.43%              
Borrowings under credit facilities   $ 0                  
Repayments under credit facility   0                  
Outstanding borrowings   0                  
Fair value of debt   $ 182,800,000     $ 177,900,000            
Revolving Credit Facility | Base rate                      
Debt Instrument [Line Items]                      
Margin spread on interest rate (percent)   0.50%                  
Revolving Credit Facility | SOFR                      
Debt Instrument [Line Items]                      
Margin spread on interest rate (percent)   0.10%                  
Revolving Credit Facility | SOFR | Maximum                      
Debt Instrument [Line Items]                      
Margin spread on interest rate (percent)   1.50%                  
Revolving Credit Facility | Global Credit Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Borrowing capacity $ 300,000,000 $ 200,000,000       $ 250,000,000          
Outstanding borrowings   0                  
Borrowings under credit facility   $ 0                  
Revolving Credit Facility | Global Credit Revolving Credit Facility | Base rate                      
Debt Instrument [Line Items]                      
Margin spread on interest rate (percent) 1.00%                    
Revolving Credit Facility | Global Credit Revolving Credit Facility | SOFR                      
Debt Instrument [Line Items]                      
Margin spread on interest rate (percent) 2.00%