ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	[1]	$ (245.3)
Foreign currency translation adjustment, net of tax	[2]	2.7		$ (13.4)
Amortization of pension related costs, net of tax	[3],[4]	1.8		1.7
Revaluation of derivative financial instrument, net of amounts reclassified into earnings and tax benefit		(0.9)
Other comprehensive income (loss)		3.6	[5]	(13.6)
Ending Balance		(241.7)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Currency translation adjustment, tax expense (benefit)		0.1		(2.6)
Amortization of pension related costs, tax expense (benefit)		0.3		0.3
Revaluation of derivative financial instrument, tax expense (benefit)		(0.5)		$ (1.2)
Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(23.5)
Foreign currency translation adjustment, net of tax		2.7
Other comprehensive income (loss)		2.7
Ending Balance		(20.8)
Actuarial (Loss) Gain on Post-retirement Benefits [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(217.7)
Amortization of pension related costs, net of tax		1.8
Other comprehensive income (loss)		1.8
Ending Balance		(215.9)
Deferred Gain (Loss) - Hedging [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(3.8)
Revaluation of derivative financial instrument, net of amounts reclassified into earnings and tax benefit		(0.9)
Other comprehensive income (loss)		(0.9)
Ending Balance		(4.7)
Other [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(0.3)
Other comprehensive income (loss)		0.0
Ending Balance		$ (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] Net of tax expense (benefit) of $0.1 million and $(2.6) million for the three months ended March 31, 2016 and 2015, respectively.

[3] Net of tax expense of $0.3 million for each of the three months ended March 31, 2016 and 2015.

[4] This other comprehensive income component is included in the computation of net periodic benefit (income) costs. See Note 11, “Pension and Post-Retirement Benefits,” for additional information regarding net periodic benefit (income) costs.

[5] See Note 13, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive income (loss) during the three months ended March 31, 2016.