ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Unrealized Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment Out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax benefit	$ (0.2)	$ 3.9
Net of tax	1.1	(4.6)
Interest Rate Contract
Reclassification Adjustment Out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Unrealized gain (loss) on derivative instruments	0.1	(6.8)
Loss on derivatives reclassified into income	1.3	0.6
Total before tax	1.4	(6.2)
Tax benefit	(0.3)	1.6
Net of tax	$ 1.1	$ (4.6)