Guarantor and Non-Guarantor Financial Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Parent	Mar. 31, 2013 Parent	Dec. 31, 2013 Parent	Mar. 31, 2014 Guarantor Subsidiaries	Mar. 31, 2013 Guarantor Subsidiaries	Dec. 31, 2013 Guarantor Subsidiaries	Mar. 31, 2014 Non-Guarantor Subsidiaries	Mar. 31, 2013 Non-Guarantor Subsidiaries	Dec. 31, 2013 Non-Guarantor Subsidiaries	Mar. 31, 2014 Consolidating Adjustments	Mar. 31, 2013 Consolidating Adjustments	Dec. 31, 2013 Consolidating Adjustments	May 23, 2012 Senior Notes
Condensed Financial Statements [Line Items]
Principal amount of notes																$ 225.0
Ownership interest by parent	100.00%
Current assets:
Cash and cash equivalents	185.6	248.0		5.0	5.0		174.3	241.6		6.3	1.4		0	0
Short-term investments	104.5		129.5	0		0	104.5		129.5	0		0	0		0
Receivables:
Trade, less allowance for doubtful receivables	123.5		119.8	0		0	119.5		117.7	4.0		2.1	0		0
Intercompany receivables	0		0	32.2		0	25.4		0.1	0.7		0.2	(58.3)		(0.3)
Other	11.7		13.4	0		0	5.9		5.3	5.8		8.1	0		0
Inventories	203.1		214.4	0		0	198.0		208.6	5.8		6.4	(0.7)		(0.6)
Prepaid expenses and other current assets	48.6		44.2	0.1		0.1	48.0		43.7	0.5		0.4	0		0
Total current assets	677.0		690.8	37.3		5.1	675.6		662.6	23.1		24.0	(59.0)		(0.9)
Investments in and advances to subsidiaries	0		0	1,466.5		1,437.9	26.9		26.5	0		0	(1,493.4)		(1,464.4)
Property, plant, and equipment – net	436.7		429.3	0		0	421.6		414.0	15.1		15.3	0		0
Long-term intercompany receivables	0		0	0		31.3	1.1		1.6	10.6		9.5	(11.7)		(42.4)
Net asset of VEBAs	414.1		406.0	0		0	414.1		406.0	0		0	0		0
Deferred tax assets — net	59.2		69.1	0		0	50.2		60.2	0		0	9.0		8.9
Intangible assets – net	33.3		33.7	0		0	33.3		33.7	0		0	0		0
Goodwill	37.2		37.2	0		0	37.2		37.2	0		0	0		0
Other assets	108.5		104.8	90.1		86.2	18.3		18.5	0.1		0.1	0		0
Total	1,766.0		1,770.9	1,593.9		1,560.5	1,678.3		1,660.3	48.9		48.9	(1,555.1)		(1,498.8)
Current liabilities:
Accounts payable	72.3		62.9	0.4		1.1	66.6		56.3	5.3		5.5	0		0
Intercompany payable	0		0	22.8		0	36.9		13.9	1.9		0.1	(61.6)		(14.0)
Accrued salaries, wages, and related expenses	33.2		42.7	0		0	29.9		39.3	3.3		3.4	0		0
Other accrued liabilities	37.1		44.8	10.1		3.5	25.8		39.9	1.2		1.4	0		0
Short-term capital lease	0.2		0.2	0		0	0.2		0.2	0		0	0		0
Total current liabilities	142.8		150.6	33.3		4.6	159.4		149.6	11.7		10.4	(61.6)		(14.0)
Deferred tax liability	1.2		1.2	0		0	0		0	1.2		1.2	0		0
Long-term intercompany payable	0		0	1.0		0	10.7		40.7	0		1.7	(11.7)		(42.4)
Long-term liabilities	149.0		146.4	86.6		83.2	51.3		52.0	11.1		11.2	0		0
Long-term debt	390.7		388.5	390.7		388.5	0		0	0		0	0		0
Total liabilities	683.7		686.7	511.6		476.3	221.4		242.3	24.0		24.5	(73.3)		(56.4)
Total stockholders’ equity	1,082.3		1,084.2	1,082.3		1,084.2	1,456.9		1,418.0	24.9		24.4	(1,481.8)		(1,442.4)
Total	1,766.0		1,770.9	1,593.9		1,560.5	1,678.3		1,660.3	48.9		48.9	(1,555.1)		(1,498.8)
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	335.1	337.4		0	0		327.1	331.8		33.1	30.4		(25.1)	(24.8)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	282.9	263.6		0	0		278.9	259.7		28.4	27.0		(24.4)	(23.1)
Unrealized (gains) losses on derivative instruments	(2.0)	0.7		0	0		(2.0)	0.7		0	0		0	0
Depreciation and amortization	7.4	7.0		0	0		7.1	6.7		0.3	0.3		0	0
Selling, administrative, research and development, and general	20.3	21.7		1.0	0.4		16.6	20.4		3.3	2.4		(0.6)	(1.5)
Net periodic pension benefit income relating to VEBAs	(5.6)	(5.6)		0	0		(5.6)	(5.6)		0	0		0	0
Total selling, administrative, research and development, and general	14.7	16.1		1.0	0.4		11.0	14.8		3.3	2.4		(0.6)	(1.5)
Total costs and expenses	303.0	287.4		1.0	0.4		295.0	281.9		32.0	29.7		(25.0)	(24.6)
Operating (loss) income	32.1	50.0		(1.0)	(0.4)		32.1	49.9		1.1	0.7		(0.1)	(0.2)
Other (expense) income:
Interest (expense) income	(8.8)	(9.3)		(9.3)	(9.1)		0.4	(0.3)		0	0		0.1	0.1
Other income, net	1.9	1.0		1.0	0.4		1.2	0.6		(0.2)	0.1		(0.1)	(0.1)
(Loss) income before income taxes	25.2	41.7		(9.3)	(9.1)		33.7	50.2		0.9	0.8		(0.1)	(0.2)
Income tax (provision) benefit	(9.4)	(8.2)		0	0		(12.6)	(19.0)		(0.3)	7.2		3.5	3.6
Earnings in equity of subsidiaries	0	0		25.1	42.6		0.4	7.8		0	0		(25.5)	(50.4)
Net income	15.8	33.5		15.8	33.5		21.5	39.0		0.6	8.0		(22.1)	(47.0)
Comprehensive income	16.7	34.7		16.7	34.7		22.2	39.8		0.8	8.4		(23.0)	(48.2)
Cash flows from operating activities:
Net cash (used in) provided by operating activities	27.1	6.3		(11.0)	(0.5)		35.8	5.4		2.3	1.4		0	0
Cash flows from investing activities:
Capital expenditures	(15.4)	(9.3)		0	0		(15.4)	(9.0)		0	(0.3)		0	0
Purchase of available for sale securities	0	(85.6)			0			(85.6)			0			0
Proceeds from disposition of available for sale securities	25.0	85.2		0	0		25.0	85.2		0	0		0	0
Net cash provided by (used in) investing activities	9.6	(9.7)		0	0		9.6	(9.4)		0	(0.3)		0	0
Cash flows from financing activities:
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	0.7	0.8		0	0		0.7	0.8		0	0		0	0
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	(2.2)	(2.2)		(2.2)	(2.2)		0	0		0	0		0	0
Cash dividend paid to stockholders	(6.4)	(5.9)		(6.4)	(5.9)		0	0		0	0		0	0
Repurchase of common stock	(12.7)	(14.7)		(12.7)	(14.7)		0	0		0	0		0	0
Intercompany loan	0	0		32.3	23.3		(29.5)	(21.2)		(2.8)	(2.1)		0	0
Net cash provided by (used in) financing activities	(20.6)	(22.0)		11.0	0.5		(28.8)	(20.4)		(2.8)	(2.1)		0	0
Net increase (decrease) in cash and cash equivalents during the period	16.1	(25.4)		0	0		16.6	(24.4)		(0.5)	(1.0)		0	0
Cash and cash equivalents at beginning of period	169.5	273.4		5.0	5.0		157.7	266.0		6.8	2.4		0	0
Cash and cash equivalents at end of period	$ 185.6	$ 248.0		$ 5.0	$ 5.0		$ 174.3	$ 241.6		$ 6.3	$ 1.4		$ 0	$ 0