CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) - 6 months ended Jun. 30, 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	66.9				66.9
Stock-based compensation	9.0		8.7	0.3
Shares issued under stock plans (shares)		1.1
Shares issued under stock plans	22.8	$ 0.3	14.7	7.8
Shares repurchased under share repurchase program	(17.2)			(17.2)
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	13.1		13.1
Dividends declared	(17.7)				(17.7)
Other comprehensive income, net of tax	12.3					12.3
Balance at Jun. 30, 2016	$ 1,109.4	$ 18.4	$ 240.6	$ (13.1)	$ 1,013.8	$ (150.3)
Balance (in shares) at Jun. 30, 2016		73.4