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Stock-Based Compensation (Details)
3 Months Ended 9 Months Ended
Feb. 14, 2019
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
performance_period
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Jan. 09, 2019
USD ($)
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized amount under share repurchase program           $ 200,000,000  
Repurchases of common stock (in shares) | shares       1,271,823      
Repurchases of common stock       $ 24,900,000      
Repurchases of common stock, average price (in dollars per share) | $ / shares       $ 19.55      
Stock options granted (in shares) | shares       2,353,599 663,343    
Stock-based compensation expense (reduction to expense)   $ 3,700,000 $ 2,900,000 $ 10,400,000 $ 8,800,000    
Phantom share units (PSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense (reduction to expense)   500,000 700,000 2,100,000 2,200,000    
Liability for cash-settled awards   1,300,000   1,300,000     $ 1,700,000
Unrecognized compensation cost, other awards   3,100,000   $ 3,100,000      
Unamortized compensation costs, weighted average period of recognition       1 year 10 months 6 days      
Amounts paid on cash-settled awards       $ 2,500,000 4,200,000    
Phantom share units (PSUs) | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       3 years      
Phantom share units (PSUs) | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       4 years      
Stock appreciation rights (SARs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense (reduction to expense)   (500,000) $ 1,100,000 $ 2,000,000.0 6,900,000    
Vesting period       4 years      
Liability for cash-settled awards   6,600,000   $ 6,600,000     $ 6,800,000
Unrecognized compensation cost, other awards   $ 5,500,000   $ 5,500,000      
Unamortized compensation costs, weighted average period of recognition       2 years 7 months 13 days      
Amounts paid on cash-settled awards       $ 2,200,000 $ 9,800,000    
2018 Long Term Incentive Compensation Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for future grants (in shares) | shares   8,442,068   8,442,068      
Performance Share Program | Performance shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards granted (in shares) | shares 278,780            
Award period       3 years      
Number of annual award performance periods | performance_period       3      
Service period       1 year      
Vesting period       3 years      
Performance Share Program | Performance shares | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of award which can potentially be earned       50.00%      
Performance Share Program | Performance shares | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of award which can potentially be earned       150.00%