CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) (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 [Member]
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
Increase (Decrease) in Equity [Roll Forward]
Net income	61.9				61.9
Stock-based compensation	6.0		6.0
Shares issued under stock plans	13.5	0.1	14.1	(0.7)
Shares repurchased for employee tax withholdings (in shares)		(0.1)
Shares issued under stock plans (in shares)		0.5
Shares repurchased for employee tax withholdings	(5.2)		(5.2)
Excess tax benefit from employee stock plans	1.1		1.1
Dividends declared	(6.5)				(6.5)
Other comprehensive loss, net of tax	(15.5)					(15.5)
Balance at Jun. 30, 2013	$ 784.2	$ 8.7	$ 95.3	$ (3.7)	$ 775.3	$ (91.4)
Balance (in shares) at Jun. 30, 2013		34.8