CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) - 3 months ended Mar. 31, 2016 - USD ($) shares in Millions, $ in Millions	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, 2015	$ 1,023.9	$ 18.1	$ 207.8	$ (4.0)	$ 964.6	$ (162.6)
Balance (in shares) at Dec. 31, 2015		72.4
Increase (Decrease) in Equity [Roll Forward]
Net income	22.1				22.1
Stock-based compensation	5.0		4.7	0.3
Shares issued under stock plans (shares)		1.0
Shares issued under stock plans	18.9	$ 0.2	18.7
Shares repurchased under share repurchase program	(9.1)			(9.1)
Shares repurchased for employee tax withholdings (shares)		(0.1)
Shares repurchased for employee tax withholdings	(3.7)		(3.7)
Excess tax benefit from employee stock plans	11.0		11.0
Dividends declared	(8.7)				(8.7)
Other comprehensive loss, net of tax	14.6					14.6
Balance at Mar. 31, 2016	$ 1,074.0	$ 18.3	$ 238.5	$ (12.8)	$ 978.0	$ (148.0)
Balance (in shares) at Mar. 31, 2016		73.3