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Financing Agreements - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Aug. 30, 2019
Feb. 28, 2019
Sep. 30, 2019
Term A Facility [Member]        
Debt Instrument [Line Items]        
Current aggregate facility     $ 500,000,000  
Net proceeds     225,000,000  
Periodic installments     8,000,000  
Interest rate at period end       3.544%
Term B Facility [Member]        
Debt Instrument [Line Items]        
Current aggregate facility     450,000,000  
Net proceeds     $ 450,000,000  
Periodic payments as a percentage of the aggregate principal advances     0.25%  
Interest rate at period end       4.294%
Term Facility [Member]        
Debt Instrument [Line Items]        
Financing costs       $ 13,000,000
Revolving Facility [Member]        
Debt Instrument [Line Items]        
Current aggregate facility   $ 1,000,000,000 $ 750,000,000  
Net proceeds   $ 100,000,000    
Financing costs       $ 4,000,000
Interest rate at period end       3.544%
Fronting fee rate       0.125%
Amount outstanding       $ 100,000,000
Utilized for letters of credit       21,000,000
Available borrowing capacity       879,000,000
Revolving Facility [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Amount that may be applied to letters of credit       $ 275,000,000
Base Rate [Member] | Term B Facility [Member]        
Debt Instrument [Line Items]        
Margin rate       1.25%
Eurodollar Rate [Member] | Term B Facility [Member]        
Debt Instrument [Line Items]        
Margin rate       2.25%
Forecast [Member] | Term A Facility [Member]        
Debt Instrument [Line Items]        
Periodic installments $ 7,000,000