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Borrowings - Additional Information (Details)
€ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
EUR (€)
Jul. 31, 2023
USD ($)
Dec. 31, 2022
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   $ 31,400,000 $ 27,300,000 $ 91,800,000 $ 82,000,000.0                
Borrowings   2,300,000,000   2,300,000,000       $ 2,296,700,000          
Fair value of collateralized loan obligation assets   6,600,000,000   $ 6,600,000,000       6,200,000,000          
Senior Notes                          
Debt Instrument [Line Items]                          
Debt redemption price percentage (percent)       100.00%                  
CLO Borrowings                          
Debt Instrument [Line Items]                          
Interest expense   6,800,000 2,800,000 $ 17,800,000 6,800,000                
Borrowings   425,000,000.0   425,000,000.0       421,700,000          
CLO Term Loan February 2017 Maturing September 2029                          
Debt Instrument [Line Items]                          
Borrowings | €                     € 36.1    
Outstanding borrowings   $ 38,200,000   $ 38,200,000                  
CLO Term Loan February 2017 Maturing September 2029 | Euribor                          
Debt Instrument [Line Items]                          
Interest rate under credit facility   5.55%   5.55%   5.55%              
Master Credit Agreements - Term Loans                          
Debt Instrument [Line Items]                          
Outstanding borrowings   $ 92,700,000   $ 92,700,000                  
CLO Financing Facility                          
Debt Instrument [Line Items]                          
Outstanding borrowings   228,600,000   228,600,000   € 216.1              
CBAM CLO Financing Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity | €           100.0              
Outstanding borrowings   65,500,000   65,500,000   € 61.9              
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   289,700,000   $ 289,700,000       322,200,000          
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 $ 400,000,000
Fair value of debt   497,500,000   $ 497,500,000       545,800,000          
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 of debt   $ 381,000,000.0   $ 381,000,000.0       364,100,000          
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 $ 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       120 days                  
Period from rating agency event that debt may be redeemed       90 days                  
Fair value of debt   $ 328,400,000   $ 328,400,000       $ 323,800,000          
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity   $ 1,000,000,000   $ 1,000,000,000                  
Interest rate under credit facility   6.42%   6.42%   6.42%              
Borrowings under credit facilities   $ 0   $ 0                  
Repayments under credit facility   0   0                  
Outstanding borrowings   0   $ 0                  
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   $ 200,000,000     $ 250,000,000            
Outstanding borrowings   0   0                  
Borrowings under credit facility   $ 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%