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SHARE-BASED AWARDS - SUMMARY (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) plan $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Share-based expense (net of estimated forfeitures) |  |  |
Total share-based expense | $ | $ 19.3 | $ 18.8 | $ 11.3
Intrinsic value of options exercised | $ |  | 5.8 | 0.5
Tax benefit realized upon option exercise | $ | 8.0 | 3.3 | 2.0
Fair value of stock vested | $ | 33.5 | $ 13.1 | $ 8.2
Stock options |  |  |
Share-based expense (net of estimated forfeitures) |  |  |
Unrecognized compensation cost | $ | $ 0.0 |  |
Activity in the entity's stock option plans |  |  |
Outstanding, end of period (in shares) | 0 |  |
Exercisable, end of period (in shares) | 0 |  |
Stock options, outstanding | 0 |  |
Stock options, exercisable | 0 |  |
Non-vested restricted stock units and performance-based equity awards |  |  |
Share-based expense (net of estimated forfeitures) |  |  |
Unrecognized compensation cost | $ | $ 20.8 |  |
Unrecognized compensation cost, weighted average period for recognition | 1 year 8 months 12 days |  |
Restricted Stock Units |  |  |
Share-based compensation |  |  |
Options granted, weighted average grant-date fair value (in dollars per share) | $ / shares | $ 68.41 |  |
Activity in the entity's stock option plans |  |  |
Added by performance factor (in shares) | 172,000 |  |
2016 Plan |  |  |
Share-based compensation |  |  |
Common stock initially available for future issuance (in shares) | 4,350,000 |  |
Additional shares authorized for issuance | 0 |  |
Number of separate incentive compensation programs | plan | 4 |  |
Number of share based compensation plans within the entity's incentive compensation programs | plan | 3 |  |
2016 Plan | Discretionary Grant Program |  |  |
Share-based compensation |  |  |
Minimum exercise price as a percentage of fair market value of common stock | 100.00% |  |
Exercisable period | 3 years |  |
Expiration Term | 10 years |  |
2016 Plan | Time Based Restricted Stock Units | Stock Issuance Program |  |  |
Share-based compensation |  |  |
Vesting period of awards granted | 3 years |  |
2016 Plan | Time Based Restricted Stock Units | Automatic Grant Program |  |  |
Share-based compensation |  |  |
Vesting period of awards granted | 1 year |  |
2016 Plan | Performance Based Restricted Stock Units | Stock Issuance Program |  |  |
Share-based compensation |  |  |
Vesting period of awards granted | 3 years |  |
2016 Plan | Restricted Stock Units |  |  |
Activity in the entity's stock option plans |  |  |
Added by performance factor (in shares) | 172,000 |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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