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Borrowings - Additional Information (Details)
1 Months Ended 3 Months Ended
Dec. 17, 2018
Nov. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Oct. 22, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Aug. 06, 2020
EUR (€)
Feb. 05, 2019
EUR (€)
Feb. 28, 2017
EUR (€)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                            
Interest expense     $ 27,800,000 $ 23,000,000.0                    
Outstanding borrowings     2,255,000,000     $ 2,071,600,000                
Interest Expense     17,200,000 19,700,000                    
Fair value of collateralized loan obligation assets     $ 6,500,000,000     6,700,000,000                
Senior Notes                            
Debt Instrument [Line Items]                            
Debt redemption price percentage (percent)     100.00%                      
Interest Expense   $ 10,100,000                        
CLO Borrowings                            
Debt Instrument [Line Items]                            
Interest expense     $ 1,700,000 1,900,000                    
Outstanding borrowings     402,200,000     219,000,000.0                
CLO Term Loan Maturing November 2031                            
Debt Instrument [Line Items]                            
Debt principal amount | €                       € 36,100,000    
Outstanding borrowings     $ 40,000,000                      
CLO Term Loan Maturing November 2031 | Euribor                            
Debt Instrument [Line Items]                            
Interest rate under credit facility     2.33%   2.33%                  
CLO Financing Facility                            
Debt Instrument [Line Items]                            
Borrowing capacity | €                     € 100,000,000      
Outstanding borrowings     $ 208,300,000   € 188,000,000                  
Master Credit Agreements - Term Loans                            
Debt Instrument [Line Items]                            
Outstanding borrowings     98,600,000                      
CBAM CLO Financing Facility                            
Debt Instrument [Line Items]                            
Borrowing capacity | €                   € 100,000,000        
Outstanding borrowings     50,500,000   € 45,600,000                  
5.650% Senior Notes Due 9/15/2048                            
Debt Instrument [Line Items]                            
Outstanding borrowings     $ 346,200,000     346,100,000                
Interest rate (percent)     5.65%   5.65%                  
5.650% Senior Notes Due 9/15/2048 | Senior Notes                            
Debt Instrument [Line Items]                            
Debt principal amount     $ 350,000,000.0                      
Interest Expense     5,000,000.0 5,000,000.0                    
Fair value of debt     $ 408,700,000     484,700,000                
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]                            
Outstanding borrowings     $ 600,600,000     600,600,000                
Interest rate (percent)     5.625%   5.625%                  
5.625% Senior Notes Due 3/30/2043 | Senior Notes                            
Debt Instrument [Line Items]                            
Debt principal amount     $ 600,000,000.0                   $ 200,000,000 $ 400,000,000
Interest Expense     8,400,000 8,400,000                    
Fair value of debt     $ 671,200,000     795,500,000                
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]                            
Outstanding borrowings     $ 421,700,000     421,600,000                
Interest rate (percent)     3.50%   3.50%                  
3.500% Senior Notes Due 9/19/2029 | Senior Notes                            
Debt Instrument [Line Items]                            
Debt principal amount     $ 425,000,000.0                      
Interest rate (percent)     3.50%   3.50%                  
Interest Expense     $ 3,800,000 3,800,000                    
Fair value of debt     $ 418,700,000     457,400,000                
3.500% Senior Notes Due 9/19/2029 | Treasury rate | Senior Notes                            
Debt Instrument [Line Items]                            
Discount rate, spread on variable rate     0.30%                      
3.875% Senior Notes Due 2/01/2023                            
Debt Instrument [Line Items]                            
Interest rate (percent)     3.875%   3.875%                  
3.875% Senior Notes Due 2/01/2023 | Senior Notes                            
Debt Instrument [Line Items]                            
Debt principal amount     $ 0       $ 250,000,000              
Interest rate (percent)     3.875%   3.875%                  
Interest Expense     $ 0 $ 2,500,000                    
Fair value of debt     $ 0     0                
3.875% Senior Notes Due 2/01/2023 | 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                      
Debt principal amount               $ 65,000,000 $ 435,000,000          
Outstanding borrowings     $ 484,300,000     484,300,000                
Debt redemption price percentage (percent)     102.00%                      
Interest rate (percent)     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     $ 435,600,000     $ 506,000,000                
3.875% Senior Notes Due November 2021                            
Debt Instrument [Line Items]                            
Interest rate (percent)             3.875%              
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024                            
Debt Instrument [Line Items]                            
Borrowing capacity     $ 775,000,000                      
Interest rate under credit facility     1.58%   1.58%                  
Borrowings under credit facilities     $ 0                      
Repayments under credit facility     0                      
Outstanding borrowings     $ 0                      
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024 | Base rate                            
Debt Instrument [Line Items]                            
Margin spread on interest rate (percent)     0.50%                      
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024 | 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                      
Borrowings under credit facility     0                      
Outstanding borrowings     $ 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 | Eurocurrency                            
Debt Instrument [Line Items]                            
Margin spread on interest rate (percent) 2.00%