ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	[1]			$ (587.5)
Other comprehensive income		$ 5.3	$ (1.3)	13.7	[2]	$ (12.4)
Ending balance		(559.6)		(559.6)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(245.3)
Other comprehensive income	[2]			13.7
Ending balance		(231.6)		(231.6)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(23.5)
Other comprehensive income				8.0
Ending balance		(15.5)		(15.5)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Other comprehensive income (loss), tax expense (benefit)				1.3
Actuarial (Loss) Gain on Post-retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(217.7)
Other comprehensive income				5.6
Ending balance		(212.1)		(212.1)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Other comprehensive income (loss), tax expense (benefit)				1.1
Deferred Gain (Loss) - Hedging [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(3.8)
Other comprehensive income				0.1
Ending balance		(3.7)		(3.7)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Other comprehensive income (loss), tax expense (benefit)				0.1
Other [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(0.3)
Other comprehensive income				0.0
Ending balance		$ (0.3)		$ (0.3)

[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2016. See Note 1, "Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements" for details of these adjustments.

[2] See Note 13, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive income during the nine months ended September 30, 2016.