ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (243.2)	$ (149.8)	$ (208.2)
Unrealized gains (losses), net of tax				(4.1)
Foreign currency translation adjustment, net of tax	[1]	(18.1)	(24.6)	(4.1)
Amortization of pension related costs, net of tax	[2],[3]	7.2	4.5	7.7
Pension re-measurement, net of tax	[4]	(6.9)	(69.6)	53.3
Settlement of certain pension liabilities	[5]	17.3	0.0	0.0
Revaluation of derivative financial instrument, net of tax		(1.6)	(3.7)	1.5
Other			0.0
Other comprehensive (loss) income	[6]	(2.1)	(93.4)	58.4
Ending Balance		(245.3)	(243.2)	(149.8)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Unrealized gains (losses), tax expense (benefit)				(3.3)
Currency translation adjustment, tax expense (benefit)		(5.1)	(2.1)	(3.3)
Amortization of pension related costs, tax expense (benefit)		1.3	0.1	1.2
Pension re-measurement, tax expense (benefit)		(3.3)	(42.0)	33.5
Settlement of certain pension liabilities, tax expense (benefit)		3.7
Revaluation of derivative financial instrument, tax expense (benefit)		(1.0)	(2.3)	1.0
Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(5.4)	19.2	23.3
Unrealized gains (losses), net of tax				(4.1)
Foreign currency translation adjustment, net of tax		$ (18.1)	(24.6)
Amortization of pension related costs, net of tax			0.0	0.0
Pension re-measurement, net of tax			0.0	0.0
Settlement of certain pension liabilities
Revaluation of derivative financial instrument, net of tax			0.0	0.0
Other			0.0
Other comprehensive (loss) income		$ (18.1)
Ending Balance		(23.5)	(5.4)	19.2
Actuarial (Loss) Gain on Post-retirement Benefits [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (235.3)	(170.5)	(231.5)
Unrealized gains (losses), net of tax				0.0
Foreign currency translation adjustment, net of tax			0.0
Amortization of pension related costs, net of tax		$ 7.2	4.5	7.7
Pension re-measurement, net of tax		(6.9)	(69.6)	53.3
Settlement of certain pension liabilities		$ 17.3
Revaluation of derivative financial instrument, net of tax			0.0	0.0
Other			0.3
Other comprehensive (loss) income		$ 17.6
Ending Balance		(217.7)	(235.3)	(170.5)
Deferred Gain (Loss) - Hedging [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (2.2)	1.5	0.0
Unrealized gains (losses), net of tax				0.0
Foreign currency translation adjustment, net of tax			0.0
Amortization of pension related costs, net of tax			0.0	0.0
Pension re-measurement, net of tax			0.0	0.0
Settlement of certain pension liabilities		$ 0.0
Revaluation of derivative financial instrument, net of tax		(1.6)	(3.7)	1.5
Other			0.0
Other comprehensive (loss) income		(1.6)
Ending Balance		(3.8)	(2.2)	1.5
Other [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (0.3)	0.0	0.0
Unrealized gains (losses), net of tax				0.0
Foreign currency translation adjustment, net of tax			0.0
Amortization of pension related costs, net of tax			0.0	0.0
Pension re-measurement, net of tax			0.0	0.0
Settlement of certain pension liabilities
Revaluation of derivative financial instrument, net of tax			0.0	0.0
Other			(0.3)
Other comprehensive (loss) income		$ 0.0
Ending Balance		$ (0.3)	$ (0.3)	$ 0.0

[1] Net of tax benefit of $5.1 million, $2.1 million and $3.3 million for 2015, 2014 and 2013, respectively.

[2] Net of tax expense of $1.3 million, $0.1 million and $1.2 million for 2015, 2014 and 2013, respectively.

[3] This other comprehensive income component is included in the computation of net periodic benefit (income) costs. See Note 14, “Savings Plan, Pension and Post-Retirement Benefits,” for additional information regarding net periodic benefit (income) costs.

[4] Net of tax (benefit) expense of $(3.3) million, $(42.0) million and $33.5 million for 2015, 2014 and 2013, respectively.

[5] Net of tax expense of $3.7 million.

[6] See Note 17, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive loss during each of 2015, 2014 and 2013.