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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-Based Compensation [Abstract] |
Schedule of the Allocation of Performance Shares Between Total Shareholder Return, Earnings per Share, and Return on Invested Capital | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019 | ​
Total shareholder return | ​ | 45 | % | 45 | % | 45 | %
Earnings per share | ​ | 36 | % | 36 | % | 36 | %
Return on invested capital | ​ | 18 | % | 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, 2020 | ​ | 502,728 | ​ | $ | 21.89 | ​ | 752,783 | ​ | $ | 24.32
Granted | ​ | 202,599 | ​ | $ | 35.13 | ​ | 215,936 | ​ | $ | 43.34
Vested | ​ | (159,755) | ​ | $ | 22.52 | ​ | (126,242) | ​ | $ | 29.61
Forfeited or cancelled | ​ | (95,241) | ​ | $ | 26.96 | ​ | (263,492) | ​ | $ | 28.35
Non-vested as of December 31, 2021 | ​ | 450,331 | ​ | $ | 26.55 | ​ | 578,985 | ​ | $ | 28.42
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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