FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets:
Other current assets	$ 0.0	$ 1.9
Other long-term assets	18.1	0.3
Total assets	18.1	2.3
Liabilities:
Accrued expenses and other current liabilities	3.2	4.2
Other long-term liabilities	17.9	40.6
Total liabilities	$ 21.1	$ 44.8

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