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	$ 17.2	$ 70.7	$ (3.0)	$ 719.9	$ (75.9)
Balance (in shares) at Dec. 31, 2012		68.8
Increase (Decrease) in Equity [Roll Forward]
Net income	88.7				88.7
Stock-based compensation	11.8		11.8
Shares issued under stock plans	21.7	0.3	22.2	(0.8)
Shares issued under stock plans (in shares)		1.3
Shares repurchased for employee tax withholdings	(5.2)		(5.2)
Shares repurchased for employee tax withholdings (in shares)		(0.2)
Excess tax benefit from employee stock plans	4.4		4.4
Dividends declared	(20.0)				(20.0)
Other comprehensive income, net of tax	6.4					6.4
Balance at Sep. 30, 2013	$ 836.7	$ 17.5	$ 103.9	$ (3.8)	$ 788.6	$ (69.5)
Balance (in shares) at Sep. 30, 2013		69.9