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Borrowings - Additional Information (Details)
€ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2023
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2024
EUR (€)
Sep. 30, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                        
Borrowings under credit facilities       $ 0 $ 10,400,000              
Interest   $ 29,800,000 $ 30,300,000 85,600,000 91,500,000              
Borrowings   3,014,300,000   3,014,300,000       $ 2,164,400,000        
Fair value of collateralized loan obligation assets   9,600,000,000   $ 9,600,000,000       7,900,000,000        
Senior Notes                        
Debt Instrument [Line Items]                        
Debt redemption price percentage (percent)       100.00%                
CLO Borrowings                        
Debt Instrument [Line Items]                        
Interest   3,700,000 6,200,000 $ 11,500,000 19,200,000              
Borrowings   339,300,000   339,300,000       289,400,000        
CLO Term Loan February 2017 Maturing September 2029                        
Debt Instrument [Line Items]                        
Borrowings   $ 13,400,000   $ 13,400,000     € 11.4          
CLO Term Loan February 2017 Maturing September 2029 | Euribor                        
Debt Instrument [Line Items]                        
Interest Rate (as percent)   4.56%   4.56%     4.56%          
CLO Financing Facility                        
Debt Instrument [Line Items]                        
Outstanding borrowings   $ 251,500,000   $ 251,500,000     € 214.1          
CBAM CLO Financing Facility                        
Debt Instrument [Line Items]                        
Borrowing capacity | €             100.0          
Outstanding borrowings   74,400,000   74,400,000     € 63.4          
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   348,500,000   $ 348,500,000       338,100,000        
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       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   603,100,000   $ 603,100,000       589,500,000        
5.625% Senior Notes Due 3/30/2043 | Treasury rate | Senior Notes                        
Debt Instrument [Line Items]                        
Discount rate, spread on variable rate       0.40%                
5.050% Senior Notes Due 9/19/2035                        
Debt Instrument [Line Items]                        
Borrowings   $ 800,000,000.0   $ 800,000,000.0       0        
Interest rate (percent)   5.05%   5.05%     5.05%          
5.050% Senior Notes Due 9/19/2035 | Senior Notes                        
Debt Instrument [Line Items]                        
Borrowings   $ 800,000,000.0   $ 800,000,000.0                
Interest rate (percent)   5.05%   5.05%     5.05%          
Fair Value   $ 797,700,000   $ 797,700,000       0        
5.050% Senior Notes Due 9/19/2035 | Treasury rate | Senior Notes                        
Debt Instrument [Line Items]                        
Discount rate, spread on variable rate       0.20%                
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   $ 413,200,000   $ 413,200,000       401,200,000        
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   5,800,000 5,800,000 $ 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%                
Interest rate (percent)   4.625%   4.625%     4.625%     4.625%    
Period from tax redemption event that debt may be redeemed (in days)       120 days                
Period from rating agency event that debt may be redeemed (in days)       90 days                
Fair Value   $ 359,600,000   $ 359,600,000       356,400,000        
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Borrowing capacity   $ 1,000,000,000   $ 1,000,000,000                
Interest rate under credit facility (percent)   5.23%   5.23%     5.23%          
Borrowings under credit facilities   $ 0 0 $ 0 0              
Outstanding borrowings   0   0                
Fair Value   61,900,000   $ 61,900,000       $ 55,100,000        
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]                        
Borrowings under credit facilities   0 $ 0 $ 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 2026                        
Debt Instrument [Line Items]                        
Borrowing capacity   $ 200,000,000   $ 200,000,000