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Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]        
Loss (gain) on debt extinguishment   $ (2,600,000) $ 260,800,000  
Amortization of Debt Discount (Premium)   (6,500,000) $ (11,200,000)  
Long-term Debt, Maturities, Repayments of Principal in Year Two   237,600,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three   450,900,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four   $ 269,700,000    
8.50% Senior notes due 2019        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   8.50%   8.50%
6.875% Senior notes due 2020        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   6.875%   6.875%
4.70% Senior notes due 2021        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   4.70%   4.70%
8.00% Senior notes due 2024        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   8.00%    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Loss (gain) on debt extinguishment $ 6,200,000      
Revolving Credit Facility [Member] | Five Year Credit Facility Member        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity   $ 2,250,000,000    
Line of Credit Facility, Commitment Fee Percentage   0.225%    
Maximum Percent of Debt to Total Capitalization Ratio   60.00%    
Line of Credit Facility, Maximum Borrowing Capacity   $ 500,000,000    
Line of Credit Facility, Fair Value of Amount Outstanding   0   $ 0
Revolving Credit Facility [Member] | Credit Facility due 2019 [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity   1,120,000,000    
Revolving Credit Facility [Member] | Credit Facility due 2020 [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity   $ 1,130,000,000    
Revolving Credit Facility [Member] | Base Rate [Member] | Five Year Credit Facility Member        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   0.50%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.50%    
Five Year Credit Facility Member        
Debt Instrument [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding   $ 0    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Amortization of Debt Discount (Premium) 3,500,000      
Amortization of Debt Issuance Costs $ 2,700,000