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Borrowings - Additional Information (Details)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
Dec. 17, 2018
USD ($)
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Oct. 22, 2021
Sep. 30, 2021
EUR (€)
Sep. 29, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Dec. 31, 2020
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           $ 70,000,000.0 $ 287,100,000                    
Repayments under credit facility           0 300,600,000                    
Outstanding borrowings     $ 2,370,700,000   $ 2,370,700,000 2,370,700,000             $ 1,970,900,000        
Interest expense     27,900,000 $ 23,000,000.0   76,400,000 72,800,000                    
Fair value of collateralized loan obligation assets     6,700,000,000   6,700,000,000 $ 6,700,000,000             6,300,000,000        
Senior Notes                                  
Debt Instrument [Line Items]                                  
Debt redemption price percentage (percent)           100.00%                      
Senior Credit Facility Due 2/11/2024 | Base rate                                  
Debt Instrument [Line Items]                                  
Margin spread on interest rate (percent)           0.50%                      
Senior Credit Facility Due 2/11/2024 | LIBOR                                  
Debt Instrument [Line Items]                                  
Margin spread on interest rate (percent)           1.50%                      
CLO Borrowings                                  
Debt Instrument [Line Items]                                  
Outstanding borrowings     198,700,000   198,700,000 $ 198,700,000             353,600,000        
Interest expense     1,200,000 $ 1,900,000   4,400,000 $ 6,600,000                    
CLO Term Loan Maturing November 2031                                  
Debt Instrument [Line Items]                                  
Outstanding borrowings     $ 54,200,000   $ 54,200,000 $ 54,200,000                      
Debt principal amount | €                             € 46,800,000    
CLO Term Loan Maturing November 2031 | Euribor                                  
Debt Instrument [Line Items]                                  
Interest rate under credit facility     2.35%   2.35% 2.35%     2.35%                
CLO Financing Facility                                  
Debt Instrument [Line Items]                                  
Borrowing capacity | €                           € 100,000,000      
Available capacity | €                 € 128,600,000                
5.650% Senior Notes Due 9/15/2048                                  
Debt Instrument [Line Items]                                  
Outstanding borrowings     $ 346,100,000   $ 346,100,000 $ 346,100,000             346,000,000.0        
Interest rate (percent)     5.65%   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 $ 350,000,000.0                      
Fair value of debt     482,700,000   482,700,000 $ 482,700,000             469,300,000        
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             600,700,000        
Interest rate (percent)     5.625%   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 $ 600,000,000.0                   $ 200,000,000 $ 400,000,000
Fair value of debt     790,000,000.0   790,000,000.0 $ 790,000,000.0             782,600,000        
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     $ 421,400,000   $ 421,400,000 $ 421,400,000             421,100,000        
Interest rate (percent)     3.50%   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 $ 425,000,000.0                      
Interest rate (percent)     3.50%   3.50% 3.50%     3.50%                
Fair value of debt     $ 456,800,000   $ 456,800,000 $ 456,800,000             476,600,000        
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]                                  
Outstanding borrowings     $ 249,700,000   $ 249,700,000 $ 249,700,000             249,500,000        
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   $ 250,000,000.0 $ 250,000,000.0                      
Interest rate (percent)     3.875%   3.875% 3.875%     3.875%                
Fair value of debt     $ 262,100,000   $ 262,100,000 $ 262,100,000             270,000,000.0        
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]                                  
Outstanding borrowings     484,200,000   484,200,000 $ 484,200,000             0        
Interest expense     $ 5,600,000   $ 8,900,000                        
Debt principal amount                     $ 65,000,000 $ 435,000,000          
Debt redemption price percentage (percent)           102.00%                      
Interest rate (percent)     4.625%   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     $ 512,400,000   $ 512,400,000 $ 512,400,000                      
3.875% Senior Notes Due November 2021 | Subsequent event                                  
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   $ 775,000,000 $ 775,000,000                      
Interest rate under credit facility     1.33%   1.33% 1.33%     1.33%                
Borrowings under credit facilities     $ 0     $ 0                      
Repayments under credit facility     0     0                      
Outstanding borrowings     0   $ 0 0                      
Revolving Credit Facility | Global Credit Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Borrowing capacity $ 250,000,000   250,000,000   250,000,000 250,000,000       $ 125,000,000              
Outstanding borrowings     70,000,000.0   $ 70,000,000.0 $ 70,000,000.0             $ 0        
Debt term           3 years                      
Debt termination           1 year                      
Borrowings under credit facility     $ 70,000,000     $ 70,000,000                      
Revolving Credit Facility | Global Credit Revolving Credit Facility | Subsequent event                                  
Debt Instrument [Line Items]                                  
Repayments under credit facility   $ 70,000,000                              
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%                                
Interest rate under credit facility     2.085%   2.085% 2.085%     2.085%                
Short-term Line of Credit | Global Credit Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Borrowing capacity $ 125,000,000                                
Debt term 1 year                                
Long-term Line of Credit | Global Credit Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Borrowing capacity $ 125,000,000                                
Debt term 3 years