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SHARE-BASED COMPENSATION (Details) - Time-based and performance-based shares - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation |  |  |  |
Shares granted | 900 |  | 238,400 |
Weighted-average grant date fair value (in dollars per share) | $ 75.07 |  | $ 68.39 |
Total unrecognized compensation cost | $ 25.8 |  | $ 25.8 |
Unrecognized compensation cost over weighted-average period to be recognized |  |  | 1 year 8 months 12 days |
Selling, general and administrative expenses |  |  |  |
Share-based compensation |  |  |  |
Total stock-based compensation cost | $ 4.7 | $ 5.9 | $ 14.2 | $ 12.0

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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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