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Financing Agreements - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 18, 2017
Sep. 14, 2017
Aug. 17, 2017
Apr. 04, 2017
Jun. 23, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]                      
Loss on extinguishment of debt         $ 6,000,000   $ 13,000,000 $ 19,000,000 $ 17,000,000  
Redemption premium                 15,000,000 12,000,000  
Write-off of deferred financing costs                 4,000,000 5,000,000  
Deferred financing payments                 9,000,000 $ 10,000,000  
Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Current aggregate facility $ 275,000,000           275,000,000   275,000,000    
Revolving Facility [Member]                      
Debt Instrument [Line Items]                      
Current aggregate facility 600,000,000           600,000,000   $ 600,000,000    
Deferred financing payments       $ 2,000,000              
Fronting fee rate                 0.125%    
Amount outstanding 0           0   $ 0    
Utilized for letters of credit 21,000,000           21,000,000   21,000,000    
Available borrowing capacity 579,000,000           579,000,000   579,000,000    
Maximum [Member] | Revolving Facility [Member]                      
Debt Instrument [Line Items]                      
Amount that may be applied to letters of credit $ 275,000,000           $ 275,000,000   $ 275,000,000    
Senior Notes Due September 2021 [Member]                      
Debt Instrument [Line Items]                      
Senior notes redeemed   $ 350,000,000     $ 100,000,000            
Debt redemption price   102.688%     104.031%            
Loss on extinguishment of debt   $ 13,000,000                  
Redemption premium   10,000,000     $ 4,000,000            
Write-off of deferred financing costs   $ 3,000,000     1,000,000            
Interest rate 5.375%           5.375%   5.375%   5.375%
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         $ 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%                    
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          
Term Facility [Member]                      
Debt Instrument [Line Items]                      
Net proceeds     $ 274,000,000                
Financing costs     $ 1,000,000                
Periodic payments as a percentage of the initial principal amount 1.5625%                    
Interest rate at period end 2.98667%           2.98667%   2.98667%    
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%.