ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		$ (614.8)
Other comprehensive income		9.9	[1]	$ 3.6
Ending balance		(642.0)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(251.7)
Other comprehensive income	[1]	9.9
Ending balance		(241.8)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(24.0)
Other comprehensive income		4.7
Ending balance		(19.3)
Other comprehensive income (loss), tax benefit (expense)		(1.0)
Actuarial (Loss) Gain on Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(224.4)
Other comprehensive income		4.6
Ending balance		(219.8)
Actuarial (Loss) Gain on Post-retirement Benefits - Amortization of pension related costs
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income		2.0
Other comprehensive income (loss), tax benefit (expense)		(0.4)
Actuarial (Loss) Gain on Post-retirement Benefits - Net gain (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income		2.6
Other comprehensive income (loss), tax benefit (expense)		(0.3)
Deferred Gain (Loss) - Hedging
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(3.0)
Other comprehensive income		0.6
Ending balance		(2.4)
Deferred Gain (Loss) - Hedging - amortization of deferred gains (losses) related to the de-designated 2013 Interest Rate Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income		0.6
Other comprehensive income (loss), tax benefit (expense)		0.4
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(0.3)
Other comprehensive income		0.0
Ending balance		$ (0.3)

[1] See Note 13, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive loss during the three months ended March 31, 2017.