CONSOLIDATED STATEMENT OF EQUITY (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Balance at Dec. 31, 2009	$ 579.1	$ 8.6	$ 72.9	$ (52.1)	$ 569.4	$ (19.7)
Balance (in shares) at Dec. 31, 2009		34.3		1.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65.3				65.3
Stock-based compensation	6.7		6.7
Shares issued under stock plans	8.3		(4.4)	12.7
Shares repurchased for employee tax wihholdings (in shares)				0.1
Shares issued under stock plans (in shares)				(0.4)
Shares repurchased for employee tax withholdings	(2.1)			(2.1)
Excess tax benefit from employee stock plans	2.1		2.1
Dividends declared	(22.1)				(22.1)
Other comprehensive loss, net of tax	(11.6)					(11.6)
Balance at Dec. 31, 2010	625.7	8.6	77.3	(41.5)	612.6	(31.3)
Balance (in shares) at Dec. 31, 2010		34.3		1.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	75.5				75.5
Stock-based compensation	8.6		8.6
Shares issued under stock plans	8.9		(13.1)	22.0
Shares repurchased for employee tax wihholdings (in shares)				0.1
Shares issued under stock plans (in shares)				(0.5)
Shares repurchased for employee tax withholdings	(3.5)			(3.5)
Excess tax benefit from employee stock plans	3.5		3.5
Dividends declared	(23.6)				(23.6)
Other comprehensive loss, net of tax	(40.2)					(40.2)
Balance at Dec. 31, 2011	654.9	8.6	76.3	(23.0)	664.5	(71.5)
Balance (in shares) at Dec. 31, 2011		34.3		0.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80.7				80.7
Stock-based compensation	10.9		10.9
Shares issued under stock plans	11.9		(12.5)	24.4
Shares repurchased for employee tax wihholdings (in shares)				0.1
Shares issued under stock plans (in shares)		0.1		(0.6)
Shares repurchased for employee tax withholdings	(4.7)		(0.3)	(4.4)
Excess tax benefit from employee stock plans	4.9		4.9
Dividends declared	(25.3)				(25.3)
Other comprehensive loss, net of tax	(4.4)					(4.4)
Balance at Dec. 31, 2012	$ 728.9	$ 8.6	$ 79.3	$ (3.0)	$ 719.9	$ (75.9)
Balance (in shares) at Dec. 31, 2012		34.4		0.1