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Long-Term Debt - Amended Credit Agreement (Details) - USD ($)
Dec. 31, 2020
Apr. 15, 2016
Debt Instrument [Line Items]    
Long-term debt $ 3,589,500,000  
Term Loan B Facility    
Debt Instrument [Line Items]    
Long-term debt   $ 2,400,000,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity   $ 1,970,000,000