Guarantor and Non-Guarantor Financial Statements, Comprehensive Income Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 371.7	$ 335.1
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	302.3	282.9
Unrealized losses (gains) on derivative instruments	4.5	(2.0)
Depreciation and amortization	8.0	7.4
Selling, administrative, research and development, and general	22.7	20.3
Net periodic pension benefit income relating to VEBAs	0.6	(5.6)
Defined Benefit Plan, Curtailments	492.2
Total selling, administrative, research and development, and general	515.5	14.7
Total costs and expenses	830.3	303.0
Operating (loss) income	(458.6)	32.1
Other (expense) income:
Interest (expense) income	(9.8)	(8.8)
Other income, net	0.4	1.9
(Loss) income before income taxes	(468.0)	25.2
Income tax (provision) benefit	175.8	(9.4)
Earnings in equity of subsidiaries	0	0
Net (loss) income	(292.2)	15.8
Comprehensive income	(225.3)	16.7
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	0	0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	0	0
Unrealized losses (gains) on derivative instruments	0	0
Depreciation and amortization	0	0
Selling, administrative, research and development, and general	1.0	1.0
Net periodic pension benefit income relating to VEBAs	0	0
Defined Benefit Plan, Curtailments	0
Total selling, administrative, research and development, and general	1.0	1.0
Total costs and expenses	1.0	1.0
Operating (loss) income	(1.0)	(1.0)
Other (expense) income:
Interest (expense) income	(9.5)	(9.3)
Other income, net	0	1.0
(Loss) income before income taxes	(10.5)	(9.3)
Income tax (provision) benefit	0	0
Earnings in equity of subsidiaries	(281.7)	25.1
Net (loss) income	(292.2)	15.8
Comprehensive income	(225.3)	16.7
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	363.4	327.1
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	296.4	278.9
Unrealized losses (gains) on derivative instruments	4.5	(2.0)
Depreciation and amortization	7.7	7.1
Selling, administrative, research and development, and general	20.7	16.6
Net periodic pension benefit income relating to VEBAs	0.6	(5.6)
Defined Benefit Plan, Curtailments	492.2
Total selling, administrative, research and development, and general	513.5	11.0
Total costs and expenses	822.1	295.0
Operating (loss) income	(458.7)	32.1
Other (expense) income:
Interest (expense) income	(0.5)	0.4
Other income, net	0.5	1.2
(Loss) income before income taxes	(458.7)	33.7
Income tax (provision) benefit	171.9	(12.6)
Earnings in equity of subsidiaries	1.1	0.4
Net (loss) income	(285.7)	21.5
Comprehensive income	(218.9)	22.2
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	34.7	33.1
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	31.6	28.4
Unrealized losses (gains) on derivative instruments	0	0
Depreciation and amortization	0.3	0.3
Selling, administrative, research and development, and general	1.6	3.3
Net periodic pension benefit income relating to VEBAs	0	0
Defined Benefit Plan, Curtailments	0
Total selling, administrative, research and development, and general	1.6	3.3
Total costs and expenses	33.5	32.0
Operating (loss) income	1.2	1.1
Other (expense) income:
Interest (expense) income	0	0
Other income, net	0.1	(0.2)
(Loss) income before income taxes	1.3	0.9
Income tax (provision) benefit	0	(0.3)
Earnings in equity of subsidiaries	0	0
Net (loss) income	1.3	0.6
Comprehensive income	1.4	0.8
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(26.4)	(25.1)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	(25.7)	(24.4)
Unrealized losses (gains) on derivative instruments	0	0
Depreciation and amortization	0	0
Selling, administrative, research and development, and general	(0.6)	(0.6)
Net periodic pension benefit income relating to VEBAs	0	0
Defined Benefit Plan, Curtailments	0
Total selling, administrative, research and development, and general	(0.6)	(0.6)
Total costs and expenses	(26.3)	(25.0)
Operating (loss) income	(0.1)	(0.1)
Other (expense) income:
Interest (expense) income	0.2	0.1
Other income, net	(0.2)	(0.1)
(Loss) income before income taxes	(0.1)	(0.1)
Income tax (provision) benefit	3.9	3.5
Earnings in equity of subsidiaries	280.6	(25.5)
Net (loss) income	284.4	(22.1)
Comprehensive income	$ 217.5	$ (23.0)