Guarantor and Non-Guarantor Financial Statements, Comprehensive Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 344.1	$ 328.9	$ 679.2	$ 666.3
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	275.5	261.5	558.4	525.1
Unrealized (gains) losses on derivative instruments	(1.6)	4.2	(3.6)	4.9
Depreciation and amortization	7.7	7.0	15.1	14.0
Selling, administrative, research and development, and general	22.0	21.8	42.3	43.5
Net periodic pension benefit income relating to VEBAs	(6.1)	(5.7)	(11.7)	(11.3)
Total selling, administrative, research and development, and general	15.9	16.1	30.6	32.2
Other operating charges, net	0.2	0	0.2	0
Total costs and expenses	297.7	288.8	600.7	576.2
Operating (loss) income	46.4	40.1	78.5	90.1
Other (expense) income:
Interest (expense) income	(9.2)	(9.0)	(18.0)	(18.3)
Other income, net	1.8	(0.8)	3.7	0.2
(Loss) income before income taxes	39.0	30.3	64.2	72.0
Income tax (provision) benefit	(14.5)	(11.7)	(23.9)	(19.9)
Earnings in equity of subsidiaries	0	0	0	0
Net income	24.5	18.6	40.3	52.1
Comprehensive income	26.6	19.9	43.3	54.6
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 (gains) losses on derivative instruments	0	0	0	0
Depreciation and amortization	0	0	0	0
Selling, administrative, research and development, and general	1.2	1.1	2.2	1.5
Net periodic pension benefit income relating to VEBAs	0	0	0	0
Total selling, administrative, research and development, and general	1.2	1.1	2.2	1.5
Other operating charges, net	0		0
Total costs and expenses	1.2	1.1	2.2	1.5
Operating (loss) income	(1.2)	(1.1)	(2.2)	(1.5)
Other (expense) income:
Interest (expense) income	(9.3)	(9.0)	(18.6)	(18.1)
Other income, net	0.4	(0.9)	1.4	(0.5)
(Loss) income before income taxes	(10.1)	(11.0)	(19.4)	(20.1)
Income tax (provision) benefit	0	0	0	0
Earnings in equity of subsidiaries	34.6	29.6	59.7	72.2
Net income	24.5	18.6	40.3	52.1
Comprehensive income	26.6	19.9	43.3	54.6
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	335.7	324.7	662.8	656.5
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	270.8	258.9	549.7	518.6
Unrealized (gains) losses on derivative instruments	(1.6)	4.2	(3.6)	4.9
Depreciation and amortization	7.5	6.8	14.6	13.5
Selling, administrative, research and development, and general	18.5	20.2	35.1	40.6
Net periodic pension benefit income relating to VEBAs	(6.1)	(5.7)	(11.7)	(11.3)
Total selling, administrative, research and development, and general	12.4	14.5	23.4	29.3
Other operating charges, net	0.2		0.2
Total costs and expenses	289.3	284.4	584.3	566.3
Operating (loss) income	46.4	40.3	78.5	90.2
Other (expense) income:
Interest (expense) income	0	0	0.4	(0.3)
Other income, net	0.8	0.3	2.0	0.9
(Loss) income before income taxes	47.2	40.6	80.9	90.8
Income tax (provision) benefit	(17.8)	(15.1)	(30.4)	(34.1)
Earnings in equity of subsidiaries	1.4	(0.1)	1.8	7.7
Net income	30.8	25.4	52.3	64.4
Comprehensive income	33.0	26.3	55.2	66.1
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	34.0	29.6	67.1	60.0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	29.7	26.3	58.1	53.3
Unrealized (gains) losses on derivative instruments	0	0	0	0
Depreciation and amortization	0.2	0.2	0.5	0.5
Selling, administrative, research and development, and general	2.9	2.1	6.2	4.5
Net periodic pension benefit income relating to VEBAs	0	0	0	0
Total selling, administrative, research and development, and general	2.9	2.1	6.2	4.5
Other operating charges, net	0		0
Total costs and expenses	32.8	28.6	64.8	58.3
Operating (loss) income	1.2	1.0	2.3	1.7
Other (expense) income:
Interest (expense) income	0	0	0	0
Other income, net	0.7	(0.2)	0.5	(0.1)
(Loss) income before income taxes	1.9	0.8	2.8	1.6
Income tax (provision) benefit	(0.5)	(0.7)	(0.8)	6.5
Earnings in equity of subsidiaries	0	0	0	0
Net income	1.4	0.1	2.0	8.1
Comprehensive income	1.3	0.5	2.1	8.9
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(25.6)	(25.4)	(50.7)	(50.2)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	(25.0)	(23.7)	(49.4)	(46.8)
Unrealized (gains) losses on derivative instruments	0	0	0	0
Depreciation and amortization	0	0	0	0
Selling, administrative, research and development, and general	(0.6)	(1.6)	(1.2)	(3.1)
Net periodic pension benefit income relating to VEBAs	0	0	0	0
Total selling, administrative, research and development, and general	(0.6)	(1.6)	(1.2)	(3.1)
Other operating charges, net	0		0
Total costs and expenses	(25.6)	(25.3)	(50.6)	(49.9)
Operating (loss) income	0	(0.1)	(0.1)	(0.3)
Other (expense) income:
Interest (expense) income	0.1	0	0.2	0.1
Other income, net	(0.1)	0	(0.2)	(0.1)
(Loss) income before income taxes	0	(0.1)	(0.1)	(0.3)
Income tax (provision) benefit	3.8	4.1	7.3	7.7
Earnings in equity of subsidiaries	(36.0)	(29.5)	(61.5)	(79.9)
Net income	(32.2)	(25.5)	(54.3)	(72.5)
Comprehensive income	$ (34.3)	$ (26.8)	$ (57.3)	$ (75.0)