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Borrowings - Additional Information (Details)
€ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2023
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2024
EUR (€)
Jun. 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   $ 28,000,000.0 $ 30,400,000 55,800,000 61,200,000              
Borrowings   2,176,700,000   2,176,700,000       $ 2,164,400,000        
Fair value of collateralized loan obligation assets   9,200,000,000   $ 9,200,000,000       7,900,000,000        
Senior Notes                        
Debt Instrument [Line Items]                        
Debt redemption price percentage (percent)       100.00%                
CLO Borrowings                        
Debt Instrument [Line Items]                        
Interest   4,000,000.0 6,200,000 $ 7,800,000 13,000,000.0              
Borrowings   301,700,000   301,700,000       289,400,000        
CLO Term Loan February 2017 Maturing September 2029                        
Debt Instrument [Line Items]                        
Borrowings   $ 16,100,000   $ 16,100,000     € 13.7          
CLO Term Loan February 2017 Maturing September 2029 | Euribor                        
Debt Instrument [Line Items]                        
Interest Rate (as percent)   5.03%   5.03%     5.03%          
CLO Financing Facility                        
Debt Instrument [Line Items]                        
Outstanding borrowings   $ 211,100,000   $ 211,100,000     € 179.4          
CBAM CLO Financing Facility                        
Debt Instrument [Line Items]                        
Borrowing capacity | €             100.0          
Outstanding borrowings   74,500,000   74,500,000     € 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   338,600,000   $ 338,600,000       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   585,000,000.0   $ 585,000,000.0       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%                
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   $ 412,400,000   $ 412,400,000       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   5,900,000 5,900,000 $ 11,800,000 11,800,000              
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   $ 335,000,000   $ 335,000,000       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)   5.42%   5.42%     5.42%          
Borrowings under credit facilities   $ 0 0 $ 0 $ 0              
Outstanding borrowings   0   0                
Fair Value   133,100,000   $ 133,100,000       $ 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 $ 5,000,000 $ 0   € 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