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Borrowings - Additional Information (Details)
€ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Dec. 17, 2018
Nov. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
EUR (€)
Dec. 31, 2021
USD ($)
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       $ 26,900,000   $ 25,500,000 $ 54,700,000 $ 48,500,000              
Outstanding borrowings       2,239,100,000     2,239,100,000     $ 2,071,600,000          
Interest expense       17,200,000   19,700,000 34,400,000 39,400,000              
Fair value of collateralized loan obligation assets       6,400,000,000     $ 6,400,000,000     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       2,300,000   1,200,000 $ 4,000,000 3,200,000              
Outstanding borrowings       386,000,000.0     386,000,000.0     219,000,000.0          
CLO Term Loan Maturing November 2031                              
Debt Instrument [Line Items]                              
Debt principal amount | €                         € 36.1    
Outstanding borrowings       $ 37,900,000     $ 37,900,000                
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       197,000,000     197,000,000   € 188.0            
CBAM CLO Financing Facility                              
Debt Instrument [Line Items]                              
Borrowing capacity | €                 100.0            
Outstanding borrowings       47,800,000     47,800,000   € 45.6            
5.650% Senior Notes Due 9/15/2048                              
Debt Instrument [Line Items]                              
Outstanding borrowings       $ 346,200,000     $ 346,200,000     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 9,900,000 9,900,000              
Fair value of debt       346,400,000     $ 346,400,000     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 16,900,000 16,900,000              
Fair value of debt       581,900,000     $ 581,900,000     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       $ 421,800,000     $ 421,800,000     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 $ 7,600,000 7,600,000              
Fair value of debt       $ 390,300,000     $ 390,300,000     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 5,000,000.0              
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     $ 3,300,000 5,900,000     $ 11,800,000                
Debt principal amount     $ 65,000,000     $ 65,000,000   $ 65,000,000     $ 435,000,000        
Outstanding borrowings       $ 484,500,000     $ 484,500,000     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       $ 362,400,000     $ 362,400,000     $ 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       2.79%     2.79%   2.79%            
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%