Guarantor and Non-Guarantor Financial Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011		Dec. 31, 2011	Sep. 30, 2012 Parent	Sep. 30, 2011 Parent	Sep. 30, 2012 Parent	Sep. 30, 2011 Parent	Dec. 31, 2011 Parent	Sep. 30, 2012 Guarantor Subsidiaries	Sep. 30, 2011 Guarantor Subsidiaries	Sep. 30, 2012 Guarantor Subsidiaries	Sep. 30, 2011 Guarantor Subsidiaries	Dec. 31, 2011 Guarantor Subsidiaries	Sep. 30, 2012 Non-Guarantor Subsidiaries	Sep. 30, 2011 Non-Guarantor Subsidiaries	Sep. 30, 2012 Non-Guarantor Subsidiaries	Sep. 30, 2011 Non-Guarantor Subsidiaries	Dec. 31, 2011 Non-Guarantor Subsidiaries	Sep. 30, 2012 Consolidating Adjustments	Sep. 30, 2011 Consolidating Adjustments	Sep. 30, 2012 Consolidating Adjustments	Sep. 30, 2011 Consolidating Adjustments	Dec. 31, 2011 Consolidating Adjustments	Sep. 30, 2012 Senior Notes	May 23, 2012 Senior Notes
Condensed Financial Statements
Debt Instrument, Face Amount																												$ 225.0
Current assets:
Cash and cash equivalents	255.6	23.6	255.6	23.6			5.0	5.1	5.0	5.1		250.0	17.8	250.0	17.8		0.6	0.7	0.6	0.7		0	0	0	0
Short-term investments	79.9		79.9			0	0		0			79.9		79.9			0		0			0		0
Receivables
Trade, less allowance for doubtful receivables	156.4		156.4			98.9	0		0		0	151.7		151.7		96.0	4.7		4.7		2.9	0		0		0
Intercompany receivables	0		0			0	0		0		0	0.2		0.2		2.3	0.3		0.3		0.2	(0.5)		(0.5)		(2.5)
Other	1.7		1.7			1.2	0		0		0	1.5		1.5		0.8	0.2		0.2		0.4	0		0		0
Inventories	189.0		189.0			205.7	0		0		0	181.9		181.9		196.6	7.1		7.1		9.1	0		0		0
Prepaid expenses and other current assets	73.1		73.1			78.9	0.1		0.1		6.9	72.2		72.2		71.0	0.8		0.8		1.0	0		0		0
Total current assets	755.7		755.7			434.5	5.1		5.1		11.9	737.4		737.4		409.7	13.7		13.7		15.4	(0.5)		(0.5)		(2.5)
Investments in and advances to unconsolidated affiliates	0		0			0	1,209.4		1,209.4		1,036.9	8.1		8.1		5.8	0		0		0	(1,217.5)		(1,217.5)		(1,042.7)
Property, plant, and equipment - net	374.7		374.7			367.8	0		0		0	362.3		362.3		355.9	12.4		12.4		11.9	0		0		0
Long-term intercompany receivables	0		0			0	182.4		182.4		0	0.5		0.5		22.0	7.4		7.4		2.5	(190.3)		(190.3)		(24.5)
Net asset in respect of VEBA	266.9		266.9			144.7	0		0		0	266.9		266.9		144.7	0		0		0	0		0		0
Deferred tax assets - net	139.7		139.7			226.9	0		0		0	131.6		131.6		218.9	(0.6)		(0.6)		(0.6)	8.7		8.7		8.6
Intangible assets - net	35.9		35.9			37.2	0		0		0	35.9		35.9		37.2	0		0		0	0		0		0
Goodwill	37.2		37.2			37.2	0		0		0	37.2		37.2		37.2	0		0		0	0		0		0
Other assets	84.2		84.2			72.3	61.3		61.3		50.2	19.9		19.9		19.2	3.2		3.2		2.9	(0.2)		(0.2)		0
Total	1,694.3		1,694.3			1,320.6	1,458.2		1,458.2		1,099.0	1,599.8		1,599.8		1,250.6	36.1		36.1		32.1	(1,399.8)		(1,399.8)		(1,061.1)
Current liabilities:
Accounts payable	66.0		66.0			62.2	0.3		0.3		0	58.5		58.5		57.1	7.2		7.2		5.1	0		0		0
Intercompany payable	0		0			0	0		0		0	0.3		0.3		0.2	0.2		0.2		2.3	(0.5)		(0.5)		(2.5)
Accrued salaries, wages, and related expenses	35.5		35.5			30.9	0		0		0	33.0		33.0		28.7	2.5		2.5		2.2	0		0		0
Other accrued liabilities	41.9		41.9			41.0	10.6		10.6		2.2	30.9		30.9		38.0	0.4		0.4		0.8	0		0		0
Payable to affiliate	14.0		14.0			14.4	0		0		0	14.0		14.0		14.4	0		0		0	0		0		0
Long-term debt-current portion	0		0			1.3					0					1.3					0					0
Total current liabilities	157.4		157.4			149.8	10.9		10.9		2.2	136.7		136.7		139.7	10.3		10.3		10.4	(0.5)		(0.5)		(2.5)
Net liability in respect of VEBA	19.9		19.9			20.6	0		0		0	19.9		19.9		20.6	0		0		0	0		0		0
Long-term Intercompany payables	0		0			0	0		0		22.0	189.8		189.8		2.5	0.5		0.5		0	(190.3)		(190.3)		(24.5)
Long-term liabilities	128.3		128.3			126.0	58.6		58.6		54.0	49.9		49.9		53.5	19.8		19.8		18.5	0		0		0
Long-term debt	378.4		378.4			151.4	378.4		378.4		148.0	0		0		3.4	0		0		0	0		0		0
Total liabilities	684.0		684.0			447.8	447.9		447.9		226.2	396.3		396.3		219.7	30.6		30.6		28.9	(190.8)		(190.8)		(27.0)
Total stockholders' equity	1,010.3		1,010.3			872.8	1,010.3		1,010.3		872.8	1,203.5		1,203.5		1,030.9	5.5		5.5		3.2	(1,209.0)		(1,209.0)		(1,034.1)
Total	1,694.3		1,694.3			1,320.6	1,458.2		1,458.2		1,099.0	1,599.8		1,599.8		1,250.6	36.1		36.1		32.1	(1,399.8)		(1,399.8)		(1,061.1)
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	335.5	322.3	1,046.1	983.7			0	0	0	0		328.6	316.2	1,019.1	957.8		32.0	38.0	96.7	108.6		(25.1)	(31.9)	(69.7)	(82.7)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization	256.6	297.7	836.1	878.6			0	0	0	0		251.4	293.3	815.7	858.1		29.7	36.0	88.6	102.0		(24.5)	(31.6)	(68.2)	(81.5)
Restructuring benefits	0	(0.3)	0	(0.3)				0		0			(0.3)		(0.3)			0		0			0		0
Depreciation and amortization	6.7	6.2	19.6	18.9			0	0	0	0		6.4	6.0	18.8	18.2		0.3	0.2	0.8	0.7		0	0	0	0
Selling, administrative, research and development, and general	16.0	13.7	48.3	47.3			0.4	0.2	1.7	1.5		14.0	13.9	45.2	41.6		2.1	(0.1)	2.8	5.4		(0.5)	(0.3)	(1.4)	(1.2)
Other operating charges (benefits), net	0	0.1	0.1	(0.2)			0	0	0	0		0	0	0.1	0.1		0	0.1	0	(0.3)		0	0	0	0
Total costs and expenses	279.3	317.4	904.1	944.3			0.4	0.2	1.7	1.5		271.8	312.9	879.8	917.7		32.1	36.2	92.2	107.8		(25.0)	(31.9)	(69.6)	(82.7)
Operating income (loss)	56.2	4.9	142.0	39.4			(0.4)	(0.2)	(1.7)	(1.5)		56.8	3.3	139.3	40.1		(0.1)	1.8	4.5	0.8		(0.1)	0	(0.1)	0
Other (expense) income:
Interest expense	(9.2)	(4.3)	(19.8)	(13.2)			(9.0)	(4.0)	(19.2)	(11.7)		(0.2)	(0.3)	(0.6)	(1.5)		0	0	0	0		0	0	0	0
Other income (expense), net	0.4	3.9	2.2	2.2			0	4.1	1.2	2.2		0.3	0.1	0.8	0.3		0.1	(0.3)	0.2	(0.3)		0	0	0	0
Income (loss) before income taxes	47.4	4.5	124.4	28.4			(9.4)	(0.1)	(19.7)	(11.0)		56.9	3.1	139.5	38.9		0	1.5	4.7	0.5		(0.1)	0	(0.1)	0
Income tax (provision) benefit	(18.2)	(0.4)	(47.7)	(9.4)			0	0	0	0		(21.6)	(1.2)	(53.1)	(14.2)		(0.6)	1.2	(2.0)	0.1		4.0	(0.4)	7.4	4.7
Earnings (losses) in equity of subsidiaries	0	0	0	0			38.6	4.2	96.4	30.0		(0.7)	2.6	2.6	0.5		0	0	0	0		(37.9)	(6.8)	(99.0)	(30.5)
Net income	29.2	4.1	76.7	19.0	[1]		29.2	4.1	76.7	19.0		34.6	4.5	89.0	25.2		(0.6)	2.7	2.7	0.6		(34.0)	(7.2)	(91.7)	(25.8)
Comprehensive income (loss)	30.1	5.2	80.2	21.3	[1]		30.1	5.2	80.2	21.3		36.0	4.8	92.9	27.0		(1.1)	3.5	2.3	1.1		(34.9)	(8.3)	(95.2)	(28.1)
Cash flows from operating activities:
Net cash provided by operating activities			106.7	20.8					(208.4)	15.3				314.8	5.0				0.3	0.5				0	0
Cash flows from investing activities:
Capital expenditures	(8.8)	(8.8)	(25.7)	(22.9)					0	0				(24.6)	(22.1)				(1.1)	(0.8)				0	0
Purchase of available for sale securities			(80.0)	(0.2)					0	0				(80.0)	(0.2)				0	0				0	0
Cash payment for acquisition of manufacturing facility and related assets (net of $4.9 of cash received in connection with the acquisition in 2011)			0	(83.2)						0					(83.2)					0					0
Change in restricted cash			6.8	(1.1)					6.9	0				0.3	(1.1)				(0.4)	0				0	0
Net cash provided by (used in) investing activities			(98.9)	(107.4)					6.9	0				(104.3)	(106.6)				(1.5)	(0.8)				0	0
Cash flows from financing activities:
Repayments of capital lease			(0.1)	(0.1)					0	0				(0.1)	(0.1)				0	0				0	0
Proceeds from issuance of senior notes			225.0	0					225.0					0					0					0
Cash paid for financing costs			(6.6)	(2.1)					(6.6)	0				0	(2.1)				0	0				0	0		(6.6)
Repayment of promissory notes			(4.7)	(8.0)					0	0				(4.7)	(8.0)				0	0				0	0
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest			1.3	0					0					1.3					0					0
Repurchase of common stock to cover employees' tax withholdings upon vesting of non-vested shares			(2.2)	(1.1)					(2.2)	(1.1)				0	0				0	0				0	0
Cash dividend paid to stockholders			(14.7)	(14.1)					(14.7)	(14.1)				0	0				0	0				0	0
Net cash provided by (used in) financing activities			198.0	(25.4)					201.5	(15.2)				(3.5)	(10.2)				0	0				0	0
Net increase (decrease) in cash and cash equivalents during the period			205.8	(112.0)					0	0.1				207.0	(111.8)				(1.2)	(0.3)				0	0
Cash and cash equivalents at beginning of period			49.8	135.6					5.0	5.0				43.0	129.6				1.8	1.0				0	0
Cash and cash equivalents at end of period	$ 255.6	$ 23.6	$ 255.6	$ 23.6			$ 5.0	$ 5.1	$ 5.0	$ 5.1		$ 250.0	$ 17.8	$ 250.0	$ 17.8		$ 0.6	$ 0.7	$ 0.6	$ 0.7		$ 0	$ 0	$ 0	$ 0

[1] Total comprehensive income and components of other comprehensive income (loss) were previously included in the Statement of Stockholders' Equity for interim reporting periods prior to 2012. The Company adopted ASU No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income, beginning with the annual period ended December 31, 2011 and presented the Statement of Comprehensive Income as its own separate statement. As such, the "Previously Reported" column reflects the changes in the presentation.