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Stock-Based Compensation (Details)
3 Months Ended
Feb. 14, 2019
shares
Mar. 31, 2019
USD ($)
performance_period
shares
Mar. 31, 2018
USD ($)
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  
Stock options granted (in shares) | shares   1,307,015 661,175    
Stock-based compensation expense (reduction to expense)   $ 3,400,000 $ 2,900,000    
Phantom share units (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense (reduction to expense)   1,100,000 100,000    
Liability for cash-settled awards   400,000     $ 1,700,000
Unrecognized compensation cost, other awards   $ 4,500,000      
Unamortized compensation costs, weighted average period of recognition   2 years 2 months 26 days      
Amounts paid on cash-settled awards   $ 2,400,000 4,100,000    
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)   $ 3,000,000.0 (4,000,000.0)    
Vesting period   4 years      
Liability for cash-settled awards   $ 8,600,000     $ 6,800,000
Unrecognized compensation cost, other awards   $ 9,600,000      
Unamortized compensation costs, weighted average period of recognition   2 years 11 months 23 days      
Amounts paid on cash-settled awards   $ 1,200,000 $ 3,000,000.0    
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   9,397,761      
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   3 years      
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%