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SHARE-BASED AWARDS (Tables) | 12 Months Ended
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Dec. 31, 2021
SHARE-BASED AWARDS |
Summary of Compensation Expense and Other Information Related to Share-Based awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, |
Share-based compensation expense, net of estimated forfeitures (in millions) |  | 2021 |  | 2020 |  | 2019 |
Share-based compensation expense | ​ | $ | 19.3 | ​ | $ | 18.8 | ​ | $ | 11.3 | ​
Intrinsic value of options exercised | ​ | $ | — | ​ | $ | 5.8 | ​ | $ | 0.5 | ​
Tax benefit realized upon stock vesting | ​ | $ | 8.0 | ​ | $ | 3.3 | ​ | $ | 2.0 | ​
Fair value of stock vested | ​ | $ | 33.5 | ​ | $ | 13.1 | ​ | $ | 8.2 | ​
Non-Vested Restricted Stock Unit Activity | The following table summarizes non-vested restricted stock unit activity through December 31, 2021 (in thousands, except weighted average grant-date fair value amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2007 Plan |  | 2016 Plan |  | Total |  | Weighted |
​ | ​ | Restricted | ​ | Restricted | ​ | Restricted | ​ | Average Grant- | ​
​ | ​ | Stock Units | ​ | Stock Units | ​ | Stock Units | ​ | Date Fair Value |
Outstanding at December 31, 2020 |  | 3 |  | 789 |  | 792 | ​ | $ | 35.14 | ​
Granted | ​ | — | ​ | 239 | ​ | 239 | ​ | ​ | 68.41 | ​
Vested | ​ | (2) | ​ | (507) | ​ | (509) | ​ | ​ | 32.54 | ​
Canceled | ​ | — | ​ | (3) | ​ | (3) | ​ | ​ | 44.27 | ​
Added by performance factor (1) | ​ | — | ​ | 172 | ​ | 172 | ​ | ​ | 31.48 | ​
Outstanding at December 31, 2021 |  | 1 |  | 690 |  | 691 | ​ | $ | 47.61 | ​
(1) | Represents shares paid out above target.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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