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Borrowings - Additional Information (Details)
€ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2023
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2024
EUR (€)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
EUR (€)
Dec. 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]                          
Borrowings under credit facilities       $ 10,400,000   $ 0              
Interest expense   $ 30,300,000 $ 31,400,000 91,500,000   91,800,000              
Borrowings   2,233,700,000   2,233,700,000       $ 2,306,700,000          
Fair value of collateralized loan obligation assets   7,100,000,000   $ 7,100,000,000       6,800,000,000          
Senior Notes                          
Debt Instrument [Line Items]                          
Debt redemption price percentage (percent)       100.00% 100.00%                
CLO Borrowings                          
Debt Instrument [Line Items]                          
Interest expense   6,200,000 6,800,000 $ 19,200,000   17,800,000              
Borrowings   358,700,000   358,700,000       431,700,000          
CLO Term Loan February 2017 Maturing September 2029                          
Debt Instrument [Line Items]                          
Borrowings   $ 27,300,000   $ 27,300,000             € 24.5    
CLO Term Loan February 2017 Maturing September 2029 | Euribor                          
Debt Instrument [Line Items]                          
Interest rate under credit facility   6.32%   6.32%     6.32%            
Master Credit Agreements - Term Loans                          
Debt Instrument [Line Items]                          
Outstanding borrowings   $ 59,100,000   $ 59,100,000                  
CLO Financing Facility                          
Debt Instrument [Line Items]                          
Outstanding borrowings   203,000,000   203,000,000     € 182.3            
CBAM CLO Financing Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity | €             100.0            
Outstanding borrowings   69,300,000   69,300,000     € 62.2            
5.650% Senior Notes Due 9/15/2048                          
Debt Instrument [Line Items]                          
Borrowings   $ 350,000,000.0   $ 350,000,000.0       350,000,000.0          
Interest rate (percent)   5.65%   5.65%     5.65%            
5.650% Senior Notes Due 9/15/2048 | Senior Notes                          
Debt Instrument [Line Items]                          
Borrowings   $ 350,000,000.0   $ 350,000,000.0                  
Fair value of debt   357,300,000   $ 357,300,000       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% 0.40%                
5.625% Senior Notes Due 3/30/2043                          
Debt Instrument [Line Items]                          
Borrowings   $ 600,000,000.0   $ 600,000,000.0       600,000,000.0          
Interest rate (percent)   5.625%   5.625%     5.625%            
5.625% Senior Notes Due 3/30/2043 | Senior Notes                          
Debt Instrument [Line Items]                          
Borrowings   $ 600,000,000.0   $ 600,000,000.0               $ 200,000,000.0 $ 400,000,000.0
Fair value of debt   613,700,000   $ 613,700,000       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% 0.40%                
3.500% Senior Notes Due 9/19/2029                          
Debt Instrument [Line Items]                          
Borrowings   $ 425,000,000.0   $ 425,000,000.0       425,000,000.0          
Interest rate (percent)   3.50%   3.50%     3.50%            
3.500% Senior Notes Due 9/19/2029 | Senior Notes                          
Debt Instrument [Line Items]                          
Borrowings   $ 425,000,000.0   $ 425,000,000.0                  
Interest rate (percent)   3.50%   3.50%     3.50%            
Fair value of debt   $ 409,000,000.0   $ 409,000,000.0       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% 0.30%                
4.625% Subordinated Notes Due 5/15/2061                          
Debt Instrument [Line Items]                          
Interest expense   5,800,000 $ 5,900,000 $ 17,600,000   $ 17,600,000              
Borrowings   $ 500,000,000.0   $ 500,000,000.0       500,000,000.0 $ 65,000,000 $ 435,000,000      
Debt redemption price percentage (percent)       102.00% 102.00%                
Interest rate (percent)   4.625%   4.625%     4.625%     4.625%      
Period from tax redemption event that debt may be redeemed       120 days 120 days                
Period from rating agency event that debt may be redeemed       90 days 90 days                
Fair value of debt   $ 390,800,000   $ 390,800,000       411,800,000          
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity   $ 1,000,000,000   $ 1,000,000,000                  
Interest rate under credit facility   5.95%   5.95%     5.95%            
Borrowings under credit facilities   $ 0   $ 0                  
Outstanding borrowings   0   0                  
Fair value of debt   186,100,000   $ 186,100,000       $ 177,900,000          
Revolving Credit Facility | Base rate                          
Debt Instrument [Line Items]                          
Margin spread on interest rate (percent)       0.50% 0.50%                
Revolving Credit Facility | SOFR                          
Debt Instrument [Line Items]                          
Margin spread on interest rate (percent)       0.10% 0.10%                
Revolving Credit Facility | SOFR | Maximum                          
Debt Instrument [Line Items]                          
Margin spread on interest rate (percent)       1.50% 1.50%                
Revolving Credit Facility | Global Credit Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowings under credit facilities   0   $ 5,000,000 € 5.0                
Outstanding borrowings   0   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%                        
Revolving Credit Facility | Global Credit Revolving Credit Facility Maturing In 2027                          
Debt Instrument [Line Items]                          
Borrowing capacity   300,000,000   300,000,000                  
Revolving Credit Facility | Global Credit Revolving Credit Facility Maturing In 2025                          
Debt Instrument [Line Items]                          
Borrowing capacity   $ 200,000,000   $ 200,000,000