SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Comprehensive Income)(Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	$ 52.7	$ 17.5	$ 60.2	$ (21.4)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	9.8	4.6	31.7	9.3
Unrealized gains (losses) on derivative contracts, net	1.3	2.6	(4.4)	3.8
Pension and postretirement liability adjustments, net	0.0	3.1	0.0	3.1
Amortization of prior service costs and actuarial losses, net	4.3	2.3	12.7	9.6
Total other comprehensive income, net of tax	15.4	12.6	40.0	25.8
Comprehensive income	68.1	30.1	100.2	4.4
Parent Guarantor
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	52.7	17.5	60.2	(21.4)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0.0	0.0	0.0	0.0
Unrealized gains (losses) on derivative contracts, net	1.3	2.6	(4.4)	3.8
Pension and postretirement liability adjustments, net		3.1		3.1
Amortization of prior service costs and actuarial losses, net	3.6	1.9	11.6	8.6
Total other comprehensive income, net of tax	4.9	7.6	7.2	15.5
Comprehensive income	57.6	25.1	67.4	(5.9)
Issuer
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	28.7	10.0	15.9	21.5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0.0	0.0	0.0	0.0
Unrealized gains (losses) on derivative contracts, net	0.0	0.0	0.0	0.0
Pension and postretirement liability adjustments, net		0.0		0.0
Amortization of prior service costs and actuarial losses, net	0.0	0.0	0.0	0.0
Total other comprehensive income, net of tax	0.0	0.0	0.0	0.0
Comprehensive income	28.7	10.0	15.9	21.5
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	80.5	40.5	151.0	67.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	9.8	4.6	31.7	9.3
Unrealized gains (losses) on derivative contracts, net	0.0	0.0	0.0	0.0
Pension and postretirement liability adjustments, net		0.0		0.0
Amortization of prior service costs and actuarial losses, net	0.7	0.4	1.1	1.0
Total other comprehensive income, net of tax	10.5	5.0	32.8	10.3
Comprehensive income	91.0	45.5	183.8	77.4
Eliminations
Supplemental Guarantor Financial Information Statements Of Comprehensive Income [Line Items]
Net income (loss)	(109.2)	(50.5)	(166.9)	(88.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0.0	0.0	0.0	0.0
Unrealized gains (losses) on derivative contracts, net	0.0	0.0	0.0	0.0
Pension and postretirement liability adjustments, net		0.0		0.0
Amortization of prior service costs and actuarial losses, net	0.0	0.0	0.0	0.0
Total other comprehensive income, net of tax	0.0	0.0	0.0	0.0
Comprehensive income	$ (109.2)	$ (50.5)	$ (166.9)	$ (88.6)