CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) (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, 2010	$ 625.7	$ 8.6	$ 77.3	$ (41.5)	$ 612.6	$ (31.3)
Balance, Beginning (in shares) at Dec. 31, 2010		34.3		(1.0)
Net income	56.7				56.7
Stock-based compensation	6.8		6.8
Shares issued under stock plans	7.1		(11.3)	18.4
Shares issued under stock plans (in shares)				0.5
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	3.2		3.2
Dividends declared	(11.5)				(11.5)
Other comprehensive income, net of tax	6.8					6.8
Balance, Ending at Sep. 30, 2011	$ 691.3	$ 8.6	$ 76.0	$ (26.6)	$ 657.8	$ (24.5)
Balance, Ending (in shares) at Sep. 30, 2011		34.3		(0.6)