CONSOLIDATED STATEMENT OF EQUITY - 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) Income [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		0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	112.3				112.3
Stock-based compensation	15.3		15.3
Shares issued under stock plans	30.5	$ 0.4	30.9	$ (0.8)
Shares repurchased for employee tax withholdings (in shares)		(0.2)
Shares repurchased for employee tax withholdings	(5.2)		(5.2)
Shares issued under stock plans (in shares)		1.8
Excess tax benefit from employee stock plans	8.3		8.3
Dividends declared	(27.2)				(27.2)
Other comprehensive income (loss), net of tax	43.5					43.5
Balance (in shares) at Dec. 31, 2013		70.4		0.2
Balance at Dec. 31, 2013	906.4	$ 17.6	120.0	$ (3.8)	805.0	(32.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	127.1				127.1
Stock-based compensation	15.2		15.5	$ (0.3)
Shares issued under stock plans	21.1	$ 0.2	20.9
Shares repurchased for employee tax withholdings (in shares)		(0.1)
Shares repurchased for employee tax withholdings	(4.1)		(4.1)
Shares issued under stock plans (in shares)		1.1		(0.1)
Excess tax benefit from employee stock plans	7.9		7.9
Dividends declared	(29.9)				(29.9)
Other comprehensive income (loss), net of tax	(86.8)					(86.8)
Balance (in shares) at Dec. 31, 2014		71.4		0.1
Balance at Dec. 31, 2014	956.9	$ 17.8	160.2	$ (4.1)	902.2	(119.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	95.6				95.6
Stock-based compensation	26.7	0.1	26.4	0.2
Shares issued under stock plans	17.8	$ 0.2	17.6
Shares repurchased for employee tax withholdings (in shares)		(0.1)
Shares repurchased for employee tax withholdings	(5.6)		(5.5)	$ (0.1)
Shares issued under stock plans (in shares)		1.1
Excess tax benefit from employee stock plans	9.1		9.1
Dividends declared	(33.2)				(33.2)
Other comprehensive income (loss), net of tax	(43.4)					(43.4)
Balance (in shares) at Dec. 31, 2015		72.4		0.1
Balance at Dec. 31, 2015	$ 1,023.9	$ 18.1	$ 207.8	$ (4.0)	$ 964.6	$ (162.6)