Guarantor and Non-Guarantor Financial Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended				3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011		Dec. 31, 2011	Jun. 30, 2012 Parent	Jun. 30, 2011 Parent	Jun. 30, 2012 Parent	Jun. 30, 2011 Parent	Dec. 31, 2011 Parent	Jun. 30, 2012 Guarantor Subsidiaries	Jun. 30, 2011 Guarantor Subsidiaries	Jun. 30, 2012 Guarantor Subsidiaries	Jun. 30, 2011 Guarantor Subsidiaries	Dec. 31, 2011 Guarantor Subsidiaries	Jun. 30, 2012 Non-Guarantor Subsidiaries	Jun. 30, 2011 Non-Guarantor Subsidiaries	Jun. 30, 2012 Non-Guarantor Subsidiaries	Jun. 30, 2011 Non-Guarantor Subsidiaries	Dec. 31, 2011 Non-Guarantor Subsidiaries	Jun. 30, 2012 Consolidating Adjustments	Jun. 30, 2011 Consolidating Adjustments	Jun. 30, 2012 Consolidating Adjustments	Jun. 30, 2011 Consolidating Adjustments	Dec. 31, 2011 Consolidating Adjustments	May 23, 2012 Senior Notes
Condensed Financial Statements
Debt Instrument, Face Amount																												$ 225.0
Current assets:
Cash and cash equivalents	317.8	59.8		317.8	59.8			5.0	4.9	5.0	4.9		311.9	54.4	311.9	54.4		0.9	0.5	0.9	0.5		0	0	0	0
Receivables
Trade, less allowance for doubtful receivables	131.3			131.3			98.9	0		0		0	127.7		127.7		96.0	3.6		3.6		2.9	0		0		0
Intercompany receivables	0			0			0	0		0		0	0		0		2.3	4.5		4.5		0.2	(4.5)		(4.5)		(2.5)
Other	1.9			1.9			1.2	0		0		0	1.6		1.6		0.8	0.3		0.3		0.4	0		0		0
Inventories	196.8			196.8			205.7	0		0		0	189.1		189.1		196.6	7.7		7.7		9.1	0		0		0
Prepaid expenses and other current assets	74.7			74.7			78.9	0		0		6.9	74.1		74.1		71.0	0.6		0.6		1.0	0		0		0
Total current assets	722.5			722.5			434.5	5.0		5.0		11.9	704.4		704.4		409.7	17.6		17.6		15.4	(4.5)		(4.5)		(2.5)
Investments in and advances to unconsolidated affiliates	0			0			0	1,168.3		1,168.3		1,036.9	9.1		9.1		5.8	0		0		0	(1,177.4)		(1,177.4)		(1,042.7)
Property, plant, and equipment - net	373.0			373.0			367.8	0		0		0	361.1		361.1		355.9	11.9		11.9		11.9	0		0		0
Intercompany long-term receivables	0			0			0	0		0		0	(188.1)		(188.1)		22.0	2.6		2.6		2.5	185.5		185.5		(24.5)
Net asset in respect of VEBA	262.3			262.3			144.7	0		0		0	262.3		262.3		144.7	0		0		0	0		0		0
Deferred tax assets - net	156.3			156.3			226.9	0		0		0	148.2		148.2		218.9	(0.6)		(0.6)		(0.6)	8.7		8.7		8.6
Intangible assets - net	36.3			36.3			37.2	0		0		0	36.3		36.3		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	73.8			73.8			72.3	51.5		51.5		50.2	19.3		19.3		19.2	3.0		3.0		2.9	0		0		0
Total	1,661.4			1,661.4			1,320.6	1,224.8		1,224.8		1,099.0	1,389.8		1,389.8		1,250.6	34.5		34.5		32.1	(987.7)		(987.7)		(1,061.1)
Current liabilities:
Accounts payable	66.5			66.5			62.2	0.5		0.5		0	59.2		59.2		57.1	6.8		6.8		5.1	0		0		0
Intercompany liabilities	0			0			0	0		0		0	4.5		4.5		0.2	0		0		2.3	(4.5)		(4.5)		(2.5)
Accrued salaries, wages, and related expenses	31.3			31.3			30.9	0		0		0	28.9		28.9		28.7	2.4		2.4		2.2	0		0		0
Other accrued liabilities	46.3			46.3			41.0	3.9		3.9		2.2	40.9		40.9		38.0	1.5		1.5		0.8	0		0		0
Payable to affiliate	18.3			18.3			14.4	0		0		0	18.3		18.3		14.4	0		0		0	0		0		0
Long-term debt-current portion	0			0			1.3	0		0		0	0		0		1.3	0		0		0	0		0		0
Total current liabilities	162.4			162.4			149.8	4.4		4.4		2.2	151.8		151.8		139.7	10.7		10.7		10.4	(4.5)		(4.5)		(2.5)
Net liability in respect of VEBA	20.1			20.1			20.6	0		0		0	20.1		20.1		20.6	0		0		0	0		0		0
Intercompany long-term liabilities	0			0			0	(188.1)		(188.1)		22.0	2.6		2.6		2.5	0		0		0	185.5		185.5		(24.5)
Long-term liabilities	118.7			118.7			126.0	48.3		48.3		54.0	53.0		53.0		53.5	17.4		17.4		18.5	0		0		0
Long-term debt	376.6			376.6			151.4	376.6		376.6		148.0	0		0		3.4	0		0		0	0		0		0
Total liabilities	677.8			677.8			447.8	241.2		241.2		226.2	227.5		227.5		219.7	28.1		28.1		28.9	181.0		181.0		(27.0)
Total stockholders' equity	983.6			983.6			872.8	983.6		983.6		872.8	1,162.3		1,162.3		1,030.9	6.4		6.4		3.2	(1,168.7)		(1,168.7)		(1,034.1)
Total	1,661.4			1,661.4			1,320.6	1,224.8		1,224.8		1,099.0	1,389.8		1,389.8		1,250.6	34.5		34.5		32.1	(987.7)		(987.7)		(1,061.1)
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	345.2	338.8		710.6	661.4			0	0	0	0		335.0	328.7	690.5	641.6		32.1	35.6	64.7	70.6		(21.9)	(25.5)	(44.6)	(50.8)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization	284.5	300.0		579.5	580.9			0	0	0	0		276.9	292.2	564.3	564.8		29.0	32.9	58.9	66.0		(21.4)	(25.1)	(43.7)	(49.9)
Depreciation and amortization	6.6	6.4		12.9	12.7			0	0	0	0		6.3	6.1	12.4	12.2		0.3	0.3	0.5	0.5		0	0	0	0
Selling, administrative, research and development, and general	14.4	18.0		32.3	33.6			0.8	0.9	1.3	1.3		13.5	13.9	31.2	27.7		0.7	3.6	0.7	5.5		(0.6)	(0.4)	(0.9)	(0.9)
Other operating charges (benefits), net	0.1	(0.3)		0.1	(0.3)			0	0	0	0		0.1	0.1	0.1	0.1		0	(0.4)	0	(0.4)		0	0	0	0
Total costs and expenses	305.6	324.1		624.8	626.9			0.8	0.9	1.3	1.3		296.8	312.3	608.0	604.8		30.0	36.4	60.1	71.6		(22.0)	(25.5)	(44.6)	(50.8)
Operating income	39.6	14.7		85.8	34.5			(0.8)	(0.9)	(1.3)	(1.3)		38.2	16.4	82.5	36.8		2.1	(0.8)	4.6	(1.0)		0.1	0	0	0
Other (expense) income:
Interest expense	(6.5)	(4.4)		(10.6)	(8.9)			(6.2)	(3.9)	(10.2)	(7.7)		(0.3)	(0.5)	(0.4)	(1.2)		0	0	0	0		0	0	0	0
Other income (expense), net	1.1	(3.4)		1.8	(1.7)			0.7	(3.5)	1.2	(1.9)		0.3	0.1	0.5	0.2		0.1	0	0.1	0		0	0	0	0
(Loss) income before income taxes	34.2	6.9		77.0	23.9			(6.3)	(8.3)	(10.3)	(10.9)		38.2	16.0	82.6	35.8		2.2	(0.8)	4.7	(1.0)		0.1	0	0	0
Income tax provision	(13.2)	(2.8)		(29.5)	(9.0)			0	0	0	0		(14.7)	(6.0)	(31.5)	(13.0)		(0.7)	(0.7)	(1.4)	(1.1)		2.2	3.9	3.4	5.1
Earnings (losses) in equity of subsidiaries	0	0		0	0			27.3	12.4	57.8	25.8		1.6	(1.5)	3.3	(2.1)		0	0	0	0		(28.9)	(10.9)	(61.1)	(23.7)
Net income	21.0	4.1	[1]	47.5	14.9	[1]		21.0	4.1	47.5	14.9		25.1	8.5	54.4	20.7		1.5	(1.5)	3.3	(2.1)		(26.6)	(7.0)	(57.7)	(18.6)
Comprehensive income (loss)	22.5	4.9		50.1	16.1			22.5	4.9	50.1	16.1		26.2	9.3	56.9	22.2		1.9	(1.5)	3.4	(2.4)		(28.1)	(7.8)	(60.3)	(19.8)
Cash flows from operating activities:
Net cash provided by operating activities				74.7	32.9					(213.6)	10.4				288.7	22.0				(0.4)	0.5				0	0
Cash flows from investing activities:
Capital expenditures	(7.9)	(7.9)		(16.9)	(14.1)					0	0				(16.4)	(13.1)				(0.5)	(1.0)				0	0
Change in restricted cash				7.2	0					6.9					0.3					0					0
Purchase of available for sale securities				(0.3)	(0.3)					0	0				(0.3)	(0.3)				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
Net cash provided by (used in) investing activities				(10.0)	(97.6)					6.9	0				(16.4)	(96.6)				(0.5)	(1.0)				0	0
Cash flows from financing activities:
Proceeds from issuance of senior notes				225.0	0					225.0					0					0					0
Cash paid for financing costs				(6.4)	0					(6.4)					0					0					0
Repayment of promissory notes				(4.7)	(0.6)					0	0				(4.7)	(0.6)				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				(2.1)	(1.1)					(2.1)	(1.1)				0	0				0	0				0	0
Cash dividend paid to stockholders				(9.8)	(9.4)					(9.8)	(9.4)				0	0				0	0				0	0
Net cash provided by (used in) financing activities				203.3	(11.1)					206.7	(10.5)				(3.4)	(0.6)				0	0				0	0
Net increase (decrease) in cash and cash equivalents during the period				268.0	(75.8)					0	(0.1)				268.9	(75.2)				(0.9)	(0.5)				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	$ 317.8	$ 59.8		$ 317.8	$ 59.8			$ 5.0	$ 4.9	$ 5.0	$ 4.9		$ 311.9	$ 54.4	$ 311.9	$ 54.4		$ 0.9	$ 0.5	$ 0.9	$ 0.5		$ 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.