CONSOLIDATED STATEMENT OF EQUITY (USD $) In Millions	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Treasury Stock [Member]	Retained earnings [Member]	Accumulated other comprehensive (loss) income [Member]
Balance, Beginning at Dec. 31, 2008	$ 487.1	$ 8.6	$ 69.3	$ (63.2)	$ 517.3	$ (44.9)
Balance, Beginning (in shares) at Dec. 31, 2008		34.3		(1.6)
Net income	72.6				72.6
Shares issued under stock plans	6.6		(5.9)	12.5
Shares issued under stock plans (in shares)				0.4
Stock-based compensation	5.5		5.5
Shares repurchased for employee tax withholdings	(1.4)			(1.4)
Shares repurchased for employee tax withholdings (in shares)				(0.1)
Excess tax benefit from employee stock plans	4.0		4.0
Cash dividends declared	(20.5)				(20.5)
Other comprehensive income (loss), net of tax	25.2					25.2
Balance, Ending at Dec. 31, 2009	579.1	8.6	72.9	(52.1)	569.4	(19.7)
Balance, Ending (in shares) at Dec. 31, 2009		34.3		(1.3)
Net income	65.3				65.3
Shares issued under stock plans	8.3		(4.4)	12.7
Shares issued under stock plans (in shares)				0.4
Stock-based compensation	6.7		6.7
Shares repurchased for employee tax withholdings	(2.1)			(2.1)
Shares repurchased for employee tax withholdings (in shares)				(0.1)
Excess tax benefit from employee stock plans	2.1		2.1
Cash dividends declared	(22.1)				(22.1)
Other comprehensive income (loss), net of tax	(11.6)					(11.6)
Balance, Ending at Dec. 31, 2010	625.7	8.6	77.3	(41.5)	612.6	(31.3)
Balance, Ending (in shares) at Dec. 31, 2010		34.3		(1.0)
Net income	75.5				75.5
Shares issued under stock plans	8.9		(13.1)	22.0
Shares issued under stock plans (in shares)				0.5
Stock-based compensation	8.6		8.6
Shares repurchased for employee tax withholdings	(3.5)			(3.5)
Shares repurchased for employee tax withholdings (in shares)				(0.1)
Excess tax benefit from employee stock plans	3.5		3.5
Cash dividends declared	(23.6)				(23.6)
Other comprehensive income (loss), net of tax	(40.2)					(40.2)
Balance, Ending at Dec. 31, 2011	$ 654.9	$ 8.6	$ 76.3	$ (23.0)	$ 664.5	$ (71.5)
Balance, Ending (in shares) at Dec. 31, 2011		34.3		(0.6)