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Debt - Narrative (Details)
Aug. 13, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Debt term extension 15 months      
Principal amount   $ 2,542,000,000   $ 2,397,000,000
Secured Debt        
Debt Instrument [Line Items]        
Principal amount   2,462,000,000   2,331,000,000
Term Loan A, Due 2024 | Secured Debt        
Debt Instrument [Line Items]        
Increase in the debt amount $ 46,000,000      
Term Loan A Facilities (Tranche 2) | Secured Debt        
Debt Instrument [Line Items]        
Principal amount   1,593,000,000   1,588,000,000
Term Loan A Facilities (Tranche 1) | Secured Debt        
Debt Instrument [Line Items]        
Principal amount 246,000,000 $ 200,000,000   $ 246,000,000
Term Loan A, Due 2022 | Secured Debt        
Debt Instrument [Line Items]        
Principal amount 200,000,000      
Revolving Credit Facility, Due 2024 | Secured Debt        
Debt Instrument [Line Items]        
Increase to credit facility 150,000,000      
Maximum borrowing capacity $ 750,000,000      
Maximum | Revolving Credit Facility and Term Loan A | On or after September 30, 2018        
Debt Instrument [Line Items]        
Debt covenant, ratio of indebtedness to EBITDA 4.50      
Maximum | Revolving Credit Facility and Term Loan A | No later than December 31, 2019        
Debt Instrument [Line Items]        
Debt covenant, ratio of indebtedness to EBITDA 4.25   3.75  
Maximum | Revolving Credit Facility and Term Loan A | Acquisition in excess of $100 million        
Debt Instrument [Line Items]        
Debt covenant, ratio of indebtedness to EBITDA 4.50   4.00  
Maximum | Term Loan A, Due 2024 | Secured Debt        
Debt Instrument [Line Items]        
Principal amount $ 1,614,000,000      
Minimum | Revolving Credit Facility and Term Loan A        
Debt Instrument [Line Items]        
Debt covenant, consideration transferred threshold amount 100,000,000      
Minimum | Term Loan A Facilities (Tranche 2) | Secured Debt        
Debt Instrument [Line Items]        
Principal amount $ 1,568,000,000