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Borrowings - Additional Information (Details)
€ in Millions
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
Dec. 17, 2018
Nov. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
EUR (€)
Dec. 31, 2021
USD ($)
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]                                
Borrowings under credit facilities             $ 0 $ 70,000,000.0                
Interest expense     $ 27,300,000   $ 27,900,000   82,000,000.0 76,400,000                
Outstanding borrowings     2,235,000,000       2,235,000,000     $ 2,071,600,000            
Interest expense     17,200,000   19,700,000   51,700,000 59,200,000                
Fair value of collateralized loan obligation assets     5,600,000,000       $ 5,600,000,000     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     2,800,000   1,200,000   $ 6,800,000 4,400,000                
Outstanding borrowings     381,600,000       381,600,000     219,000,000.0            
CLO Term Loan Maturing November 2031                                
Debt Instrument [Line Items]                                
Debt principal amount | €                           € 36.1    
Outstanding borrowings     $ 35,400,000       $ 35,400,000                  
CLO Term Loan Maturing November 2031 | Euribor                                
Debt Instrument [Line Items]                                
Interest rate under credit facility     2.33%       2.33%   2.33%              
Master Credit Agreements - Term Loans                                
Debt Instrument [Line Items]                                
Outstanding borrowings     $ 98,600,000       $ 98,600,000                  
CLO Financing Facility                                
Debt Instrument [Line Items]                                
Borrowing capacity | €                         € 100.0      
Outstanding borrowings     199,300,000       199,300,000   € 203.6              
CBAM CLO Financing Facility                                
Debt Instrument [Line Items]                                
Borrowing capacity | €                 100.0              
Outstanding borrowings     44,600,000       44,600,000   € 45.6              
5.650% Senior Notes Due 9/15/2048                                
Debt Instrument [Line Items]                                
Outstanding borrowings     $ 346,300,000       $ 346,300,000     346,100,000            
Interest rate (percent)     5.65%       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       $ 350,000,000.0                  
Interest expense     5,000,000.0   5,000,000.0   14,900,000 14,900,000                
Fair value of debt     312,600,000       $ 312,600,000     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     600,600,000            
Interest rate (percent)     5.625%       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       $ 600,000,000.0               $ 200,000,000 $ 400,000,000
Interest expense     8,400,000   8,400,000   25,300,000 25,300,000                
Fair value of debt     515,500,000       $ 515,500,000     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     $ 421,900,000       $ 421,900,000     421,600,000            
Interest rate (percent)     3.50%       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       $ 425,000,000.0                  
Interest rate (percent)     3.50%       3.50%   3.50%              
Interest expense     $ 3,800,000   3,800,000   $ 11,500,000 11,500,000                
Fair value of debt     $ 361,600,000       $ 361,600,000     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%   3.875%              
3.875% Senior Notes Due 2/01/2023 | Senior Notes                                
Debt Instrument [Line Items]                                
Debt principal amount   $ 250,000,000 $ 0       $ 0                  
Interest rate (percent)     3.875%       3.875%   3.875%              
Interest expense     $ 0   2,500,000   $ 0 $ 7,500,000                
Fair value of debt     0       $ 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   $ 5,600,000 $ 8,900,000 $ 17,600,000                  
Debt principal amount                     $ 65,000,000 $ 435,000,000        
Outstanding borrowings     $ 484,600,000       $ 484,600,000     484,300,000            
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     $ 344,000,000       $ 344,000,000     $ 506,000,000            
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024                                
Debt Instrument [Line Items]                                
Borrowing capacity     $ 1,000,000,000 $ 775,000,000     $ 1,000,000,000                  
Interest rate under credit facility     4.14%       4.14%   4.14%              
Borrowings under credit facilities     $ 0       $ 0                  
Repayments under credit facility     0       0                  
Outstanding borrowings     0       $ 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%     0.50%                  
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024 | SOFR                                
Debt Instrument [Line Items]                                
Margin spread on interest rate (percent)             0.10%                  
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024 | LIBOR                                
Debt Instrument [Line Items]                                
Margin spread on interest rate (percent)       1.50%     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%                              
Revolving Credit Facility | Global Credit Revolving Credit Facility | Eurocurrency                                
Debt Instrument [Line Items]                                
Margin spread on interest rate (percent) 2.00%