CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ 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, 2013	$ 906.4	$ 17.6	$ 120.0	$ (3.8)	$ 805.0	$ (32.4)
Balance (in shares) at Dec. 31, 2013		70,400,000		200,000
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	$ 0.0
Shares repurchased for employee tax withholdings (in shares)		(100,000)
Shares repurchased for employee tax withholdings	(4.1)		4.1
Shares issued under stock plans (in shares)		1,100,000		(100,000)
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		71,400,000		100,000
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)		(100,000)
Shares repurchased for employee tax withholdings	(5.6)		(5.5)	$ (0.1)
Shares issued under stock plans (in shares)		1,100,000		0
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		72,400,000		100,000
Balance at Dec. 31, 2015	1,023.9	$ 18.1	207.8	$ (4.0)	964.6	(162.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	143.6				143.6
Stock-based compensation	17.3	0.0	17.1	0.2
Shares issued under stock plans	$ 31.2	$ 0.3	21.0	$ 9.9
Treasury Stock, Shares, Acquired	700,000			500,000
Treasury Stock, Value, Acquired, Cost Method	$ (52.2)			$ (52.2)
Shares repurchased for employee tax withholdings (in shares)		(100,000)
Shares repurchased for employee tax withholdings	(3.7)		(3.7)	$ 0.0
Shares issued under stock plans (in shares)		1,400,000
Excess tax benefit from employee stock plans	18.2		18.2
Dividends declared	(36.6)				(36.6)
Other comprehensive income (loss), net of tax	(24.2)					(24.2)
Balance (in shares) at Dec. 31, 2016		73,700,000		600,000
Balance at Dec. 31, 2016	$ 1,117.5	$ 18.4	$ 260.4	$ (46.1)	$ 1,071.6	$ (186.8)