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SHARE-BASED COMPENSATION (Details) - Time-based and performance-based shares - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based compensation
Shares granted	225,600
Weighted-average grant date fair value (in dollars per share)	$ 68.41
Total unrecognized compensation cost	$ 35.7
Unrecognized compensation cost over weighted-average period to be recognized	2 years 3 months 18 days
Selling, general and administrative expenses
Share-based compensation
Total stock-based compensation cost	$ 4.8	$ 3.1

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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.

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