ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Unrealized Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment Out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax benefit	$ 3.9	$ (6.5)
Net of tax	(4.6)	(1.5)
Interest Rate Contract
Reclassification Adjustment Out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Unrealized gain (loss) on derivative instruments	(6.8)	(2.1)
Loss on derivatives reclassified into income	0.6	0.1
Total before tax	(6.2)	(2.0)
Tax benefit	1.6	0.5
Net of tax	$ (4.6)	$ (1.5)