SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Comprehensive Income)(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	$ 20.9	$ 13.4
Foreign currency translation adjustments, net	12.4	6.0
Unrealized losses on derivative contracts, net	(0.1)	(2.0)
Amortization of prior service costs and actuarial losses, net	5.4	3.9
Total other comprehensive income, net of tax	17.7	7.9
Comprehensive income (loss)	38.6	21.3
Parent Guarantor
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	20.9	9.7
Foreign currency translation adjustments, net	0.0	0.0
Unrealized losses on derivative contracts, net	(0.1)	(2.0)
Amortization of prior service costs and actuarial losses, net	5.4	3.7
Total other comprehensive income, net of tax	5.3	1.7
Comprehensive income (loss)	26.2	11.4
Issuer
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	(9.2)	9.4
Foreign currency translation adjustments, net	0.0	0.0
Unrealized losses on derivative contracts, net	0.0	0.0
Amortization of prior service costs and actuarial losses, net	0.0	0.0
Total other comprehensive income, net of tax	0.0	0.0
Comprehensive income (loss)	(9.2)	9.4
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	59.8	51.9
Foreign currency translation adjustments, net	12.4	6.0
Unrealized losses on derivative contracts, net	0.0	0.0
Amortization of prior service costs and actuarial losses, net	0.0	0.2
Total other comprehensive income, net of tax	12.4	6.2
Comprehensive income (loss)	72.2	58.1
Eliminations
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	(50.6)	(57.6)
Foreign currency translation adjustments, net	0.0	0.0
Unrealized losses on derivative contracts, net	0.0	0.0
Amortization of prior service costs and actuarial losses, net	0.0	0.0
Total other comprehensive income, net of tax	0.0	0.0
Comprehensive income (loss)	$ (50.6)	$ (57.6)