CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Common Stock [Member]	Capital in Excess of Par Value [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Dec. 31, 2011	$ 8.6	$ 76.3	$ (23.0)	$ 664.5	$ (71.5)	$ 654.9
Balance (in shares) at Dec. 31, 2011	34.3		(0.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				29.2		29.2
Stock-based compensation		2.2				2.2
Shares issued under stock plans		(3.5)	5.3			1.8
Shares issued under stock plans (in shares)			0.1
Shares repurchased for employee tax withholdings			(0.6)			(0.6)
Excess tax benefit from employee stock plans		0.3				0.3
Dividends declared				(6.1)		(6.1)
Other comprehensive income, net of tax					13.0	13.0
Balance at Mar. 31, 2012	$ 8.6	$ 75.3	$ (18.3)	$ 687.6	$ (58.5)	$ 694.7
Balance (in shares) at Mar. 31, 2012	34.3		(0.5)