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Debt and Credit Agreements (Details 3) - Revolving credit facility - USD ($)
Apr. 17, 2015
Apr. 16, 2015
Debt Instrument [Line Items]    
Borrowing base $ 3,400,000,000.0 $ 3,100,000,000.0
Current borrowing capacity 1,800,000,000 $ 1,400,000,000
Debt issuance cost 7,800,000  
Unamortized costs 8,300,000  
Accordion Feature, Amended Facility    
Debt Instrument [Line Items]    
Borrowing base $ 500,000,000  
Minimum    
Debt Instrument [Line Items]    
Commitment fee on the unused available balance 0.30%  
Maximum    
Debt Instrument [Line Items]    
Commitment fee on the unused available balance 0.50%  
Eurodollar LIBOR    
Debt Instrument [Line Items]    
Description of variable rate basis Eurodollar (LIBOR)  
Alternate base rate (ABR)    
Debt Instrument [Line Items]    
Description of variable rate basis alternate base rate (ABR)  
Debt Instrument Leverage Ratio Less than 1.0x | Eurodollar LIBOR    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 1.50%  
Debt Instrument Leverage Ratio Less than 1.0x | Alternate base rate (ABR)    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 0.50%  
Debt Instrument Leverage Ratio Greater than or Equal to 1.0x but Less than 2.0x | Eurodollar LIBOR    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 1.75%  
Debt Instrument Leverage Ratio Greater than or Equal to 1.0x but Less than 2.0x | Alternate base rate (ABR)    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 0.75%  
Debt Instrument Leverage Ratio Greater than or Equal to 2.0x but Less 3.0x | Eurodollar LIBOR    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 2.00%  
Debt Instrument Leverage Ratio Greater than or Equal to 2.0x but Less 3.0x | Alternate base rate (ABR)    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 1.00%  
Debt Instrument Leverage Ratio Greater than or Equal to 3.0x | Eurodollar LIBOR    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 2.25%  
Debt Instrument Leverage Ratio Greater than or Equal to 3.0x | Alternate base rate (ABR)    
Interest Rates Under Amended Credit Facility    
Basis spread on variable rate 1.25%