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Borrowings - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 17, 2018
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2017
USD ($)
vehicle
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
EUR (€)
Feb. 05, 2019
EUR (€)
Sep. 30, 2018
Feb. 28, 2017
EUR (€)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                          
Borrowings under credit facilities           $ 287,100,000 $ 42,300,000            
Outstanding borrowings   $ 1,976,300,000   $ 1,987,100,000   1,987,100,000              
Repayments under credit facility           300,600,000 17,000,000.0            
Interest expense       23,000,000.0 $ 20,000,000.0 72,800,000 59,200,000            
Borrowing outstanding   1,985,700,000   1,997,300,000   1,997,300,000              
Derivatives, number of commodities investment vehicles settled | vehicle     2                    
Fair value of collateralized loan obligation assets   5,200,000,000   5,800,000,000   $ 5,800,000,000              
Senior Notes                          
Debt Instrument [Line Items]                          
Debt redemption price percentage           100.00%              
CLO Borrowings                          
Debt Instrument [Line Items]                          
Outstanding borrowings   324,000,000.0   347,800,000   $ 347,800,000              
Interest expense       1,900,000 $ 2,800,000 6,600,000 8,700,000            
Borrowing outstanding   324,900,000   350,000,000.0   350,000,000.0              
CLO Term Loan Maturing November 2031                          
Debt Instrument [Line Items]                          
Outstanding borrowings       77,500,000   77,500,000              
Borrowing outstanding   75,300,000   $ 77,500,000   $ 77,500,000   € 66,100,000          
Debt principal amount | €                     € 66,100,000    
Repayment with penalty period           3 years              
CLO Term Loan Maturing November 2031 | Euribor                          
Debt Instrument [Line Items]                          
Interest rate under credit facility       2.33%   2.33%   2.33%          
CLO Financing Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity | €                 € 100,000,000.0        
Available capacity | €               € 45,000,000.0          
Promissory Notes Due 7/15/2019                          
Debt Instrument [Line Items]                          
Interest expense             $ 0            
Promissory Notes Due 7/15/2019 | LIBOR                          
Debt Instrument [Line Items]                          
Margin spread on interest rate     2.00%                    
Debt principal amount     $ 53,900,000                    
5.650% Senior Notes Due 9/15/2048                          
Debt Instrument [Line Items]                          
Outstanding borrowings   345,800,000   $ 346,000,000.0   $ 346,000,000.0              
Borrowing outstanding   350,000,000.0   $ 350,000,000.0   $ 350,000,000.0              
Interest rate on senior notes       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              
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   600,700,000   600,600,000   $ 600,600,000              
Borrowing outstanding   600,000,000.0   $ 600,000,000.0   $ 600,000,000.0              
Interest rate on senior notes       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           $ 200,000,000.0 $ 400,000,000.0
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   420,700,000   421,000,000.0   $ 421,000,000.0              
Borrowing outstanding   425,000,000.0   $ 425,000,000.0   $ 425,000,000.0              
Interest rate on senior notes       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 on senior notes       3.50%   3.50%   3.50%          
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   249,300,000   $ 249,400,000   $ 249,400,000              
Borrowing outstanding   250,000,000.0   $ 250,000,000.0   $ 250,000,000.0              
Interest rate on senior notes       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              
Interest rate on senior notes       3.875%   3.875%   3.875%   3.875%      
3.875% Senior Notes Due 2/01/2023 | Treasury rate | Senior Notes                          
Debt Instrument [Line Items]                          
Discount rate, spread on variable rate           0.30%              
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024                          
Debt Instrument [Line Items]                          
Borrowing capacity       $ 775,000,000.0   $ 775,000,000.0              
Interest rate under credit facility       1.40%   1.40%   1.40%          
Borrowings under credit facilities           $ 250,000,000.0              
Outstanding borrowings       $ 0   0              
Repayments under credit facility           250,000,000.0              
Interest expense       0   $ 0              
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024 | Base rate                          
Debt Instrument [Line Items]                          
Margin spread on interest rate           0.50%              
Revolving Credit Facility | Senior Credit Facility Due 2/11/2024 | LIBOR                          
Debt Instrument [Line Items]                          
Margin spread on interest rate           1.50%              
Revolving Credit Facility | Global Credit Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity $ 250,000,000.0                        
Borrowings under credit facilities       23,300,000   $ 37,100,000              
Outstanding borrowings   35,800,000   22,300,000   22,300,000              
Repayments under credit facility       5,000,000.0   50,600,000              
Interest expense       0   0              
Borrowing outstanding   $ 35,800,000   $ 22,300,000   $ 22,300,000              
Revolving Credit Facility | Global Credit Revolving Credit Facility | Base rate                          
Debt Instrument [Line Items]                          
Margin spread on interest rate 1.00%                        
Revolving Credit Facility | Global Credit Revolving Credit Facility | Eurocurrency                          
Debt Instrument [Line Items]                          
Margin spread on interest rate 2.00%                        
Short-term line of credit | Global Credit Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity $ 125,000,000.0                        
Debt term extension   1 year                      
Debt term 1 year                        
Long-term line of credit | Global Credit Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Borrowing capacity $ 125,000,000.0                        
Debt term 3 years