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Financing Agreements - Additional Information (Details) - USD ($)
6 Months Ended
Feb. 28, 2019
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]      
Deferred financing payments   $ 12,000,000
Term A Facility [Member]      
Debt Instrument [Line Items]      
Current aggregate facility $ 500,000,000    
Term B Facility [Member]      
Debt Instrument [Line Items]      
Current aggregate facility 450,000,000    
Revolving Facility [Member]      
Debt Instrument [Line Items]      
Current aggregate facility 750,000,000    
Deferred financing payments 1,000,000    
Fronting fee rate   0.125%  
Amount outstanding   $ 0  
Utilized for letters of credit   21,000,000  
Available borrowing capacity   729,000,000  
Revolving Facility [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Amount that may be applied to letters of credit   $ 275,000,000  
Line of Credit [Member]      
Debt Instrument [Line Items]      
Current aggregate facility 275,000,000    
Term A Facility [Member]      
Debt Instrument [Line Items]      
Net proceeds 225,000,000    
Periodic installments 8,000,000    
Interest rate at period end   4.152%  
Term B Facility [Member]      
Debt Instrument [Line Items]      
Net proceeds $ 450,000,000    
Periodic payments as a percentage of the aggregate principal advances 0.25%    
Interest rate at period end   4.652%  
Term Facility [Member]      
Debt Instrument [Line Items]      
Financing costs $ 12,000,000    
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%