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Borrowings - Additional Information (Details)
€ in Millions
 3 Months Ended 6 Months Ended
Dec. 17, 2018
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
EUR (€)
Dec. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Feb. 05, 2019
EUR (€)
Feb. 28, 2017
EUR (€)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                          
Interest expense   $ 30,700,000 $ 26,900,000 $ 60,400,000 $ 54,700,000                
Borrowings   2,298,400,000   2,298,400,000     $ 2,296,700,000            
Interest expense   17,400,000 17,200,000 34,600,000 34,400,000                
Fair value of collateralized loan obligation assets   7,000,000,000   $ 7,000,000,000     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   5,900,000 2,300,000 $ 11,100,000 4,000,000                
Borrowings   423,400,000   423,400,000     421,700,000            
CLO Term Loan Maturing November 2031                          
Debt Instrument [Line Items]                          
Borrowings | €                     € 36.1    
Outstanding borrowings   $ 39,400,000   $ 39,400,000                  
CLO Term Loan Maturing November 2031 | 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   $ 95,400,000   $ 95,400,000                  
CLO Financing Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity | €                   € 100.0      
Outstanding borrowings   220,900,000   220,900,000   € 202.3              
CBAM CLO Financing Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity | €           100.0              
Outstanding borrowings   67,600,000   67,600,000   € 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                  
Interest expense   5,000,000.0 5,000,000.0 10,000,000.0 9,900,000                
Fair value of debt   318,900,000   $ 318,900,000     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
Interest expense   8,500,000 8,400,000 16,900,000 16,900,000                
Fair value of debt   540,700,000   $ 540,700,000     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%              
Interest expense   $ 3,900,000 3,800,000 $ 7,700,000 7,600,000                
Fair value of debt   378,600,000   $ 378,600,000     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 $ 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       120 days                  
Period from rating agency event that debt may be redeemed       90 days                  
Fair value of debt   $ 362,600,000   $ 362,600,000     $ 323,800,000            
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity   $ 1,000,000,000 $ 775,000,000 $ 1,000,000,000 $ 775,000,000                
Interest rate under credit facility   6.24%   6.24%   6.24%              
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% 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 | LIBOR                          
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   250,000,000   $ 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%