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Earnings per Share - Additional information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Dec. 01, 2018
Dec. 01, 2015
Nov. 30, 2018
Nov. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Impact of restricted shares, restricted share units and performance share units (in shares)         2,100,000 0
Excluded from diluted earnings per share (in shares)           1,700,000
Share-based compensation expense         $ 5 $ 5
Impact of convertible notes (in shares)         600,000 0
Convertible Notes Payable | 7.875% Convertible Notes Due 2026            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Interest rate         7.875%  
Impact of convertible notes (in shares)           1,000,000
Executive Officer            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Number or shares issuable per performance share unit (in shares) 1     1    
Executive Officer | Performance Shares            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Exercise price (in usd per share) $ 16.50 $ 10.51        
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Performance period     3 years      
Shares authorized for grant (in shares)     500,000      
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Minimum            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Performance-based vesting percentage         0.00%  
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Maximum            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Performance-based vesting percentage         200.00%  
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Performance Objective One            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Award vesting rights percentage         50.00%  
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Performance Objective Two            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Award vesting rights percentage         50.00%  
Executive Officer | Performance Shares | Performance period of October 1, 2015 to September 30, 2018            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Performance period       3 years    
Performance-based vesting percentage         200.00%  
Executive Officer | Restricted Share Units (RSUs)            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Exercise price (in usd per share)   $ 10.51        
Shares granted (in shares)     400,000 500,000    
Vesting period 3 years 3 years