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, 2013	$ 906.4	$ 17.6	$ 120.0	$ (3.8)	$ 805.0	$ (32.4)
Balance (in shares) at Dec. 31, 2013		70.4
Increase (Decrease) in Equity [Roll Forward]
Net income	95.7				95.7
Stock-based compensation	11.4		11.8	(0.4)
Shares issued under stock plans (shares)		0.9
Shares issued under stock plans	16.1	0.2	15.9
Shares repurchased for employee tax withholdings (shares)		(0.1)
Shares repurchased for employee tax withholdings	(4.1)		(4.1)
Excess tax benefit from employee stock plans	5.5		5.5
Dividends declared	(22.0)				(22.0)
Other comprehensive loss, net of tax	(38.9)					(38.9)
Balance at Sep. 30, 2014	$ 970.1	$ 17.8	$ 149.1	$ (4.2)	$ 878.7	$ (71.3)
Balance (in shares) at Sep. 30, 2014		71.2