SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Operations)(Details) - USD ($) $ in Millions	3 Months Ended		89 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	$ 1,710.3	$ 1,567.1
Operating expenses:
Cost of goods sold	1,528.7	1,397.5
Selling and administration	100.5	92.9
Restructuring charges	4.0	8.2	$ 191.2
Acquisition-related costs	0.3	7.0
Other operating income (expense)	8.1	(0.4)
Operating (loss) income	84.9	61.1
Earnings of non-consolidated affiliates	0.5	0.5
Equity income in subsidiaries	0.0	0.0
Interest expense	63.7	52.4
Interest income	0.4	0.2
Non-operating pension income (expense)	5.4	8.5
Income (loss) before taxes	27.5	17.9
Income tax (benefit) provision	6.6	4.5
Net income	20.9	13.4
Parent Guarantor
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	352.7	314.8
Operating expenses:
Cost of goods sold	312.0	279.6
Selling and administration	47.1	45.8
Restructuring charges	0.0	0.0
Acquisition-related costs	0.3	7.0
Other operating income (expense)	5.8	(0.5)
Operating (loss) income	(0.9)	(18.1)
Earnings of non-consolidated affiliates	0.5	0.5
Equity income in subsidiaries	28.4	22.5
Interest expense	17.0	12.0
Interest income	1.0	0.7
Non-operating pension income (expense)	6.7	9.5
Income (loss) before taxes	18.7	3.1
Income tax (benefit) provision	(2.2)	(6.6)
Net income	20.9	9.7
Issuer
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	0.0	0.0
Operating expenses:
Cost of goods sold	0.0	0.0
Selling and administration	0.0	0.0
Restructuring charges	0.0	0.0
Acquisition-related costs	0.0	0.0
Other operating income (expense)	0.0	0.0
Operating (loss) income	0.0	0.0
Earnings of non-consolidated affiliates	0.0	0.0
Equity income in subsidiaries	22.2	35.1
Interest expense	41.3	40.9
Interest income	0.0	0.0
Non-operating pension income (expense)	0.0	0.0
Income (loss) before taxes	(19.1)	(5.8)
Income tax (benefit) provision	(9.9)	(15.2)
Net income	(9.2)	9.4
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	1,467.0	1,360.4
Operating expenses:
Cost of goods sold	1,326.1	1,226.0
Selling and administration	53.4	47.1
Restructuring charges	4.0	8.2
Acquisition-related costs	0.0	0.0
Other operating income (expense)	2.3	0.1
Operating (loss) income	85.8	79.2
Earnings of non-consolidated affiliates	0.0	0.0
Equity income in subsidiaries	0.0	0.0
Interest expense	6.9	0.9
Interest income	0.9	0.9
Non-operating pension income (expense)	(1.3)	(1.0)
Income (loss) before taxes	78.5	78.2
Income tax (benefit) provision	18.7	26.3
Net income	59.8	51.9
Eliminations
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	(109.4)	(108.1)
Operating expenses:
Cost of goods sold	(109.4)	(108.1)
Selling and administration	0.0	0.0
Restructuring charges	0.0	0.0
Acquisition-related costs	0.0	0.0
Other operating income (expense)	0.0	0.0
Operating (loss) income	0.0	0.0
Earnings of non-consolidated affiliates	0.0	0.0
Equity income in subsidiaries	(50.6)	(57.6)
Interest expense	(1.5)	(1.4)
Interest income	(1.5)	(1.4)
Non-operating pension income (expense)	0.0	0.0
Income (loss) before taxes	(50.6)	(57.6)
Income tax (benefit) provision	0.0	0.0
Net income	$ (50.6)	$ (57.6)