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Financing Agreements - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 16, 2015
Jan. 08, 2015
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
May 27, 2016
Debt Instrument [Line Items]                  
Loss on extinguishment of debt         $ (17,000,000) $ (2,000,000)  
Redemption premium             (12,000,000) (2,000,000)  
Write-off of deferred financing costs             5,000,000 1,000,000  
Deferred financing payments             10,000,000  
Revolving Facility [Member]                  
Debt Instrument [Line Items]                  
Write-off of deferred financing costs       $ 1,000,000          
Current aggregate facility     500,000,000       $ 500,000,000    
Deferred financing payments       3,000,000          
Unused capacity, Commitment fee rate             0.375%    
Line of credit facility, maximum letters of credit     275,000,000       $ 275,000,000    
Fronting fee rate             0.125%    
Line of credit facility, amount outstanding     0       $ 0    
Utilized for letters of credit     22,000,000       22,000,000    
Available borrowing capacity     $ 478,000,000       $ 478,000,000    
Revolving Facility [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Margin rate             0.75%    
Revolving Facility [Member] | Eurodollar [Member]                  
Debt Instrument [Line Items]                  
Margin rate             1.75%    
Senior Notes Due June 2026 [Member]                  
Debt Instrument [Line Items]                  
Senior notes issued                 $ 375,000,000
Net proceeds of the offering       368,000,000          
Financing costs                 $ 7,000,000
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Debt redemption price             106.50%    
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Percent of notes redeemable             35.00%    
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Percent principal amount outstanding             50.00%    
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Two [Member]                  
Debt Instrument [Line Items]                  
Debt redemption price             100.00%    
Senior Notes Due February 2021 [Member]                  
Debt Instrument [Line Items]                  
Loss on extinguishment of debt       16,000,000          
Redemption premium       12,000,000          
Write-off of deferred financing costs       $ 4,000,000          
Senior Notes Due February 2021 [Member] | Weighted Average [Member]                  
Debt Instrument [Line Items]                  
Debt redemption price       103.375%          
Senior Notes Due February 2019 [Member]                  
Debt Instrument [Line Items]                  
Loss on extinguishment of debt           $ 2,000,000      
Senior notes redeemed $ 15,000,000 $ 40,000,000              
Senior Notes Due February 2019 [Member] | Weighted Average [Member]                  
Debt Instrument [Line Items]                  
Debt redemption price 103.25% 103.00%