SHARE-BASED COMPENSATION- Summary of Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]
Total share-based compensation	$ 11.2	$ 11.3	$ 11.6
Stock appreciation rights
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]
Total share-based compensation	5.2	4.4	4.8
Performance shares
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]
Total share-based compensation	0.2	0.2	0.3
Restricted stock units
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]
Total share-based compensation	$ 5.8	$ 6.7	$ 6.5