ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ (243.2)
Currency translation adjustment, net of tax	[1]	$ (2.5)	$ (18.3)	(15.1)		$ (17.1)
Amortization of pension related costs, net of tax	[2],[3]	1.9	1.1	5.4		3.4
Revaluation of derivative financial instrument, net of tax	[4]	(0.7)	0.6	(2.7)		(2.3)
Other comprehensive (loss)		(1.3)	(16.6)	(12.4)	[5]	(16.0)
Ending Balance		(255.6)		(255.6)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Currency translation adjustment, tax expense (benefit)		(3.5)	0.2	(6.3)		(0.4)
Amortization of pension related costs, tax expense (benefit)		(0.3)	0.0	(1.0)		0.0
Revaluation of derivative financial instrument, tax expense (benefit)		0.5	$ 0.4	(1.7)		$ (1.4)
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				(5.4)
Currency translation adjustment, net of tax				$ (15.1)
Amortization of pension related costs, net of tax
Revaluation of derivative financial instrument, net of tax
Other comprehensive (loss)				$ (15.1)
Ending Balance		(20.5)		(20.5)
Actuarial (Loss) Gain on Post-retirement Benefits
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ (235.3)
Currency translation adjustment, net of tax
Amortization of pension related costs, net of tax				$ 5.4
Revaluation of derivative financial instrument, net of tax
Other comprehensive (loss)				$ 5.4
Ending Balance		(229.9)		(229.9)
Deferred Gain (Loss) - Hedging
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ (2.2)
Currency translation adjustment, net of tax
Amortization of pension related costs, net of tax
Revaluation of derivative financial instrument, net of tax				$ (2.7)
Other comprehensive (loss)				(2.7)
Ending Balance		(4.9)		(4.9)
Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ (0.3)
Currency translation adjustment, net of tax
Amortization of pension related costs, net of tax
Revaluation of derivative financial instrument, net of tax
Other comprehensive (loss)				$ 0.0
Ending Balance		$ (0.3)		$ (0.3)

[1] Net of tax benefit of $3.5 million and $0.2 million for the three months ended September 30, 2015 and 2014, respectively, and $6.3 million and $0.4 million for the nine months ended September 30, 2015 and 2014, respectively.

[2] Net of tax benefit of $0.3 million and nil for the three months ended September 30, 2015 and 2014, respectively, and $1.0 million and nil for the nine months ended September 30, 2015 and 2014, respectively.

[3] 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.

[4] Net of tax benefit of $0.5 million and $0.4 million for the three months ended September 30, 2015 and 2014, respectively, and $1.7 million and $1.4 million for the nine months ended September 30, 2015 and 2014, respectively.

[5] See Note 13, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive loss during the nine months ended September 30, 2015.