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SHARE-BASED COMPENSATION (Details) - Time Based And Performance Based Shares - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based compensation |  |  |  |
Shares granted | 12,400 |  | 180,500 |
Weighted-average grant date fair value (in dollars per share) | $ 93.32 |  | $ 100.83 |
Total unrecognized compensation cost | $ 33.9 |  | $ 33.9 |
Unrecognized compensation cost over weighted-average period to be recognized |  |  | 2 years 1 month 6 days |
Selling, general and administrative expenses |  |  |  |
Share-based compensation |  |  |  |
Total stock-based compensation cost | $ 5.8 | $ 4.7 | $ 10.5 | $ 9.5

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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