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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-Based Compensation [Abstract] |
Schedule of the Allocation of Performance Shares Between Total Shareholder Return, Earnings per Share, and Return on Invested Capital | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 | ​
Total shareholder return | ​ | 45 | % | 45 | % | 55 | %
Earnings per share | ​ | 36 | % | 36 | % | 45 | %
Return on invested capital | ​ | 18 | % | 18 | % | - | %
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time-based awards | ​ | Performance-based awards
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | average grant | ​ | Performance | ​ | average grant
​ |  | Share Units |  | date fair value |  | Shares |  | date fair value
Non-vested as of December 31, 2019 | ​ | 361,834 | ​ | $ | 25.84 | ​ | 566,336 | ​ | $ | 28.97
Granted | ​ | 306,161 | ​ | $ | 17.78 | ​ | 409,686 | ​ | $ | 17.10
Vested | ​ | (128,144) | ​ | $ | 22.13 | ​ | (145,569) | ​ | $ | 22.08
Forfeited or cancelled | ​ | (37,123) | ​ | $ | 25.37 | ​ | (77,670) | ​ | $ | 24.37
Non-vested as of December 31, 2020 | ​ | 502,728 | ​ | $ | 21.89 | ​ | 752,783 | ​ | $ | 24.32
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time-based awards | ​ | Performance-based awards
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | average grant | ​ | Performance | ​ | average grant
​ |  | Share Units |  | date fair value |  | Shares |  | date fair value
Non-vested as of December 31, 2018 | ​ | 419,996 | ​ | $ | 19.64 | ​ | 628,220 | ​ | $ | 21.41
Granted | ​ | 184,645 | ​ | $ | 30.01 | ​ | 250,858 | ​ | $ | 34.17
Vested | ​ | (196,404) | ​ | $ | 17.08 | ​ | (236,902) | ​ | $ | 14.92
Forfeited or cancelled | ​ | (46,403) | ​ | $ | 23.70 | ​ | (75,840) | ​ | $ | 27.42
Non-vested as of December 31, 2019 | ​ | 361,834 | ​ | $ | 25.84 | ​ | 566,336 | ​ | $ | 28.97
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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