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Borrowings - 5.75% Senior Secured Second Lien Notes (Details) - Senior secured term loan facility - USD ($)
Mar. 29, 2016
Nov. 25, 2015
Dec. 31, 2016
Jan. 15, 2016
5.75% Senior secured second lien notes due 2024        
Debt Instrument [Line Items]        
Interest rate (percent)   5.75% 5.75%  
Principal amount   $ 2,200,000,000.0    
Redemption price (as a percent)   100.00%    
5.0% Senior secured first lien notes due 2024        
Debt Instrument [Line Items]        
Interest rate (percent) 5.00% 5.00% 5.00%  
Principal amount $ 900,000,000      
Redemption price (as a percent) 100.00%      
8.75% Senior secured second lien notes due 2022        
Debt Instrument [Line Items]        
Interest rate (percent)   8.75% 8.75% 8.75%
Redeemed debt   $ 250,000,000    
8.25% Senior secured second lien notes due 2021        
Debt Instrument [Line Items]        
Interest rate (percent)   8.25%