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Financing Agreements - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 18, 2017
Sep. 14, 2017
Aug. 17, 2017
Apr. 04, 2017
Jun. 23, 2016
May 27, 2016
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]                        
Loss on extinguishment of debt         $ 6,000,000     $ 13,000,000 $ 6,000,000 $ 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
Paid financing costs                   $ 1,000,000 $ 9,000,000 $ 11,000,000
Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Current aggregate facility       $ 275,000,000                
Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Current aggregate facility       600,000,000                
Paid financing costs       $ 2,000,000                
Fronting fee rate                   0.125%    
Line of credit facility, amount outstanding $ 0                 $ 0    
Utilized for letters of credit 21,000,000                 21,000,000    
Available borrowing capacity 579,000,000                 579,000,000    
Revolving Credit Facility [Member] | Maximum [Member]                        
Debt Instrument [Line Items]                        
Line of credit facility applied to letters of credit $ 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              
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] | 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 One [Member] | Maximum [Member]                        
Debt Instrument [Line Items]                        
Percent of notes redeemable 35.00%                      
Senior Notes Due April 2025 [Member] | Debt Instrument, Redemption, Period Two [Member]                        
Debt Instrument [Line Items]                        
Debt redemption price 100.00%                      
Senior Notes Due 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            
Senior Notes Due June 2026 [Member]                        
Debt Instrument [Line Items]                        
Senior notes issued             $ 375,000,000          
Interest rate [1] 6.50%                 6.50% 6.50%  
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] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Percent of original principal amount that must remain outstanding after the redemption 50.00%                      
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 Two [Member]                        
Debt Instrument [Line Items]                        
Debt redemption price 100.00%                      
Other Indebtedness [Member]                        
Debt Instrument [Line Items]                        
Redemption premium         $ 1,000,000              
Term Facility [Member]                        
Debt Instrument [Line Items]                        
Net proceeds of the offering     $ 274,000,000                  
Financing costs     $ 1,000,000                  
Line Of Credit Facility, Periodic Payment, Principal, Percentage       1.5625%                
Line of Credit Facility, Interest Rate at Period End 4.27238%                 4.27238%    
Cash Flow Hedging [Member] | Senior Notes Due April 2025 [Member]                        
Debt Instrument [Line Items]                        
Interest rate 5.75%                 5.75%    
Derivative, Fixed Interest Rate 3.85%                 3.85%    
Cash Flow Hedging [Member] | Senior Notes Due June 2026 [Member]                        
Debt Instrument [Line Items]                        
Interest rate 6.50%                 6.50%    
Derivative, Fixed Interest Rate 5.14%                 5.14%    
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%    
[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%. 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%. See Note 15 for additional information.