ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes by Component (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (68.4)
Other comprehensive income (loss) before reclassifications	(4.3)
Amounts reclassified from accumulated other comprehensive loss	0.2
Net current-period other comprehensive income (loss) before income tax	(4.1)
Income tax benefit (expense)	0.5
Net of tax	(3.6)
Ending Balance	(72.0)
Unrealized gains (losses) on Interest Rate Swaps
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(1.2)
Other comprehensive income (loss) before reclassifications	(2.1)
Amounts reclassified from accumulated other comprehensive loss	0.1
Net current-period other comprehensive income (loss) before income tax	(2.0)
Income tax benefit (expense)	0.5
Net of tax	(1.5)
Ending Balance	(2.7)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(18.8)
Other comprehensive income (loss) before reclassifications	1.9
Amounts reclassified from accumulated other comprehensive loss	0.0
Net current-period other comprehensive income (loss) before income tax	1.9
Income tax benefit (expense)	0.0
Net of tax	1.9
Ending Balance	(16.9)
Foreign Currency Translation Adjustment on Long-term Intercompany Notes
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(8.1)
Other comprehensive income (loss) before reclassifications	(4.1)
Amounts reclassified from accumulated other comprehensive loss	0.0
Net current-period other comprehensive income (loss) before income tax	(4.1)
Income tax benefit (expense)	0.0
Net of tax	(4.1)
Ending Balance	(12.2)
Pension and Other Post-Employment Liability Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(40.3)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from accumulated other comprehensive loss	0.1
Net current-period other comprehensive income (loss) before income tax	0.1
Income tax benefit (expense)	0.0
Net of tax	0.1
Ending Balance	$ (40.2)