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Financing Agreements - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Apr. 04, 2017
Jun. 23, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]                
Loss on extinguishment of debt       $ 6,000,000 $ 17,000,000 $ 6,000,000 $ 17,000,000  
Redemption premium           5,000,000 12,000,000  
Write-off of deferred financing costs           1,000,000 5,000,000  
Deferred financing payments           6,000,000 $ 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   $ 500,000,000    
Deferred financing payments         $ 3,000,000      
Fronting fee rate           0.125%    
Line of credit facility, amount outstanding 0     0   $ 0    
Utilized for letters of credit 23,000,000     23,000,000   23,000,000    
Available borrowing capacity 477,000,000     477,000,000   477,000,000    
Maximum [Member] | Revolving Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility applied to letters of credit $ 275,000,000     $ 275,000,000   $ 275,000,000    
Senior Notes Due April 2025 [Member]                
Debt Instrument [Line Items]                
Senior notes issued   $ 400,000,000            
Interest rate 5.75% [1] 5.75%   5.75% [1]   5.75% [1]    
Net proceeds of the offering   $ 394,000,000            
Financing costs   6,000,000            
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period One [Member]                
Debt Instrument [Line Items]                
Debt redemption price 105.75%              
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Percent of notes redeemable 35.00%              
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period One [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Percent of original principal amount that must remain outstanding after the redemption 50.00%              
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Two [Member]                
Debt Instrument [Line Items]                
Debt redemption price 100.00%              
Senior Notes Due September 2021 [Member]                
Debt Instrument [Line Items]                
Interest rate 5.375%     5.375%   5.375%   5.375%
Senior notes redeemed   $ 100,000,000            
Debt redemption price   104.031%            
Redemption premium   $ 4,000,000            
Write-off of deferred financing costs   $ 1,000,000            
Other indebtedness [Member]                
Debt Instrument [Line Items]                
Redemption premium       $ 1,000,000        
Senior Notes Due February 2021 [Member]                
Debt Instrument [Line Items]                
Debt redemption price     103.375%          
Loss on extinguishment of debt     $ 16,000,000          
Redemption premium     12,000,000          
Write-off of deferred financing costs     $ 4,000,000          
Cash Flow Hedging [Member] | Senior Notes Due April 2025 [Member]                
Debt Instrument [Line Items]                
Interest rate 5.75%     5.75%   5.75%    
Derivative, fixed interest rate 3.85%     3.85%   3.85%    
Currency Swap [Member] | Cash Flow Hedging [Member] | Senior Notes Due April 2025 [Member]                
Debt Instrument [Line Items]                
Derivative, fixed interest rate 3.85%     3.85%   3.85%    
[1] In conjunction with the issuance of the April 2025 Notes we entered into 8-year fixed-to-fixed cross-currency swaps which have the effect of economically converting the April 2025 Notes to euro-denominated debt at a fixed rate of 3.850%. See Note 13 for additional information. In conjunction with the issuance of the June 2026 Notes we entered into 10-year fixed-to-fixed cross-currency swaps which have the effect of economically converting the June 2026 Notes to euro-denominated debt at a fixed rate of 5.140%.