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Debt (April 2017 Refinancing) (Details) - USD ($)
3 Months Ended
Apr. 27, 2017
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Principal amount     $ 8,391,518,000 $ 8,398,930,000
Debt issuance costs $ 56,700,000      
Deferred debt issuance costs $ 10,100,000 $ 51,700,000    
2017 Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument term 5 years      
Principal amount $ 1,000,000,000      
Debt issuance costs $ 10,500,000      
2017 Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent) 1.50%      
2017 Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent) 3.00%      
2017 Credit Agreement | Revolving Credit Facility | Alternative Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent) 0.50%      
2017 Credit Agreement | Revolving Credit Facility | Alternative Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent) 2.00%      
2017 Credit Agreement | Term Loan Facility        
Debt Instrument [Line Items]        
Debt instrument term 7 years      
Principal amount $ 3,415,000,000      
Debt issuance costs $ 41,300,000      
2017 Credit Agreement | Term Loan Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent) 4.25%      
Basis spread floor (as percent) 0.75%      
2017 Credit Agreement | Term Loan Facility | Alternative Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent) 3.75%      
Basis spread floor (as percent) 1.75%      
2017 Credit Agreement | Senior Notes        
Debt Instrument [Line Items]        
Principal amount     $ 1,100,000,000.0  
2017 Credit Agreement | Senior Secured Notes        
Debt Instrument [Line Items]        
Debt issuance costs $ 4,900,000      
Senior Secured Notes Due 2024        
Debt Instrument [Line Items]        
Redemption price (as percent) 101.00%      
Senior Secured Notes Due 2024 | Prior to April 15, 2020        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount redeemed (as percent) 100.00%      
Redemption price (as percent) 105.875%      
Senior Secured Notes Due 2024 | Maximum | Prior to April 15, 2020        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount redeemed (as percent) 35.00%      
Senior Secured Notes Due 2024 | Senior Notes        
Debt Instrument [Line Items]        
Principal amount $ 300,000,000      
Interest rate (as percent) 5.875%