Guarantor and Non-Guarantor Financial Statements, Comprehensive Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 338.9	$ 319.9	$ 1,018.1	$ 986.2
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	280.4	259.5	838.8	784.6
Unrealized losses (gains) on derivative instruments	3.6	(1.5)	0	3.4
Depreciation and amortization	8.0	6.9	23.1	20.9
Selling, administrative, research and development, and general	19.0	19.0	61.3	62.5
Net periodic pension benefit income relating to VEBAs	(6.0)	(5.6)	(17.7)	(16.9)
Total selling, administrative, research and development, and general	13.0	13.4	43.6	45.6
Other operating charges, net	(1.3)	0	(1.5)	0
Total costs and expenses	306.3	278.3	907.0	854.5
Operating (loss) income	32.6	41.6	111.1	131.7
Other (expense) income:
Interest (expense) income	(9.7)	(8.8)	(27.7)	(27.1)
Other income, net	2.2	2.9	5.9	3.1
(Loss) income before income taxes	25.1	35.7	89.3	107.7
Income tax (provision) benefit	(9.2)	(10.3)	(33.1)	(30.2)
Earnings in equity of subsidiaries	0	0	0	0
Net income	15.9	25.4	56.2	77.5
Comprehensive income	17.2	26.0	60.5	80.6
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	0	0	0	0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	0	0	0	0
Unrealized losses (gains) on derivative instruments	0	0		0
Depreciation and amortization	0	0	0	0
Selling, administrative, research and development, and general	0.9	1.3	3.1	2.8
Net periodic pension benefit income relating to VEBAs	0	0	0	0
Total selling, administrative, research and development, and general	0.9	1.3	3.1	2.8
Other operating charges, net	0		0
Total costs and expenses	0.9	1.3	3.1	2.8
Operating (loss) income	(0.9)	(1.3)	(3.1)	(2.8)
Other (expense) income:
Interest (expense) income	(9.4)	(9.2)	(28.0)	(27.3)
Other income, net	2.2	2.2	3.6	1.7
(Loss) income before income taxes	(8.1)	(8.3)	(27.5)	(28.4)
Income tax (provision) benefit	0	0	0	0
Earnings in equity of subsidiaries	24.0	33.7	83.7	105.9
Net income	15.9	25.4	56.2	77.5
Comprehensive income	17.2	26.0	60.5	80.6
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	330.3	315.1	993.1	971.6
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	274.7	255.8	824.4	774.4
Unrealized losses (gains) on derivative instruments	3.6	(1.5)		3.4
Depreciation and amortization	7.7	6.6	22.3	20.1
Selling, administrative, research and development, and general	17.2	16.9	52.3	57.5
Net periodic pension benefit income relating to VEBAs	(6.0)	(5.6)	(17.7)	(16.9)
Total selling, administrative, research and development, and general	11.2	11.3	34.6	40.6
Other operating charges, net	(1.3)		(1.5)
Total costs and expenses	298.5	272.2	882.8	838.5
Operating (loss) income	31.8	42.9	110.3	133.1
Other (expense) income:
Interest (expense) income	(0.5)	0.3	(0.1)	0
Other income, net	0.3	0.5	2.3	1.4
(Loss) income before income taxes	31.6	43.7	112.5	134.5
Income tax (provision) benefit	(11.9)	(18.0)	(42.3)	(52.1)
Earnings in equity of subsidiaries	1.6	4.8	3.4	12.5
Net income	21.3	30.5	73.6	94.9
Comprehensive income	22.5	31.4	77.7	97.5
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	33.6	29.1	100.7	89.1
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	29.8	26.8	87.9	80.1
Unrealized losses (gains) on derivative instruments	0	0		0
Depreciation and amortization	0.3	0.3	0.8	0.8
Selling, administrative, research and development, and general	1.7	2.0	7.9	6.5
Net periodic pension benefit income relating to VEBAs	0	0	0	0
Total selling, administrative, research and development, and general	1.7	2.0	7.9	6.5
Other operating charges, net	0		0
Total costs and expenses	31.8	29.1	96.6	87.4
Operating (loss) income	1.8	0	4.1	1.7
Other (expense) income:
Interest (expense) income	0	0	0	0
Other income, net	(0.1)	0.4	0.4	0.3
(Loss) income before income taxes	1.7	0.4	4.5	2.0
Income tax (provision) benefit	(0.1)	4.4	(0.9)	10.9
Earnings in equity of subsidiaries	0	0	0	0
Net income	1.6	4.8	3.6	12.9
Comprehensive income	1.7	4.5	3.8	13.4
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(25.0)	(24.3)	(75.7)	(74.5)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	(24.1)	(23.1)	(73.5)	(69.9)
Unrealized losses (gains) on derivative instruments	0	0		0
Depreciation and amortization	0	0	0	0
Selling, administrative, research and development, and general	(0.8)	(1.2)	(2.0)	(4.3)
Net periodic pension benefit income relating to VEBAs	0	0	0	0
Total selling, administrative, research and development, and general	(0.8)	(1.2)	(2.0)	(4.3)
Other operating charges, net	0		0
Total costs and expenses	(24.9)	(24.3)	(75.5)	(74.2)
Operating (loss) income	(0.1)	0	(0.2)	(0.3)
Other (expense) income:
Interest (expense) income	0.2	0.1	0.4	0.2
Other income, net	(0.2)	(0.2)	(0.4)	(0.3)
(Loss) income before income taxes	(0.1)	(0.1)	(0.2)	(0.4)
Income tax (provision) benefit	2.8	3.3	10.1	11.0
Earnings in equity of subsidiaries	(25.6)	(38.5)	(87.1)	(118.4)
Net income	(22.9)	(35.3)	(77.2)	(107.8)
Comprehensive income	$ (24.2)	$ (35.9)	$ (81.5)	$ (110.9)