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Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2020
Sep. 30, 2020
Sep. 30, 2020
Debt Instrument [Line Items]      
Line of credit facility, description     The External Debt Facilities contain a springing financial covenant requiring compliance with a ratio of first lien net indebtedness to consolidated EBITDA, applicable solely to the Revolving Facility. The financial covenant is tested on the last day of any fiscal quarter only if the aggregate principal amount of borrowings under the Revolving Facility and drawn but unreimbursed letters of credit exceed 35% of the total amount of commitments under the Revolving Facility on such day.
Quarterly unreimbursed letters of credit minimum percentage 35.00%    
Debt instrument, maturity period     Feb. 28, 2025
Letters of credit outstanding   $ 7,000,000 $ 7,000,000
Outstanding borrowings under revolving facility   0 $ 0
Term Loan Facility      
Debt Instrument [Line Items]      
Debt instrument, maturity period     Feb. 28, 2027
Debt instrument, periodic payment     $ 6,000,000
Debt instrument, voluntary principal payment   $ 100,000,000  
External Debt Facilities | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument, interest rate 1.75%    
External Debt Facilities | Term Loan Facility      
Debt Instrument [Line Items]      
Debt instrument, maximum borrowing capacity $ 2,475,000,000    
External Debt Facilities | Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, maximum borrowing capacity 250,000,000    
External Debt Facilities | IPO Settlement Facility      
Debt Instrument [Line Items]      
Extinguishment of debt $ 1,168,000,000