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Long-Term and Other Debt - Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 17, 2017
Nov. 21, 2014
Jun. 04, 2014
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 14, 2017
Debt Instrument [Line Items]                
Repurchase of notes         $ 1,693,400,000 $ 39,900,000 $ 0  
Gain on early extinguishment of debt         $ (38,100,000) $ 25,200,000 $ 0  
Senior Subordinated Notes, maturing 2021                
Debt Instrument [Line Items]                
Debt repurchased and cancelled       $ 9,400,000        
Repurchase of notes       5,700,000        
Gain on early extinguishment of debt       25,200,000        
Write-off of unamortized debt costs       800,000        
Senior Subordinated Notes, maturing 2020                
Debt Instrument [Line Items]                
Debt repurchased and cancelled       56,500,000        
Repurchase of notes       $ 34,200,000        
Senior Notes | Senior Unsecured Notes, maturing 2022                
Debt Instrument [Line Items]                
Debt amount   $ 2,200,000,000.0            
Redemption price percentage   100.00%            
Senior Notes | Senior Secured Notes, maturing 2022                
Debt Instrument [Line Items]                
Debt amount   $ 950,000,000.0           $ 1,150,000,000.00
Senior Notes | Senior Secured Notes, maturing 2025                
Debt Instrument [Line Items]                
Debt amount $ 350,000,000.0              
Redemption price percentage 100.00%              
Senior Subordinated Notes | Senior Subordinated Notes, maturing 2021                
Debt Instrument [Line Items]                
Debt amount     $ 350,000,000.0          
Debt instrument price percentage of principal amount     99.321%