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Restricted Cash - Narrative (Details) - USD ($)
Dec. 31, 2020
Dec. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Cash restricted for pending acquisition $ 1,050,000,000   $ 0 $ 0
Senior Notes | Senior 3.875% Notes Due 2029        
Debt Instrument [Line Items]        
Debt issued   $ 550,000,000    
Senior Notes | Senior unsecured notes, due in 2031        
Debt Instrument [Line Items]        
Debt issued   $ 500,000,000