Consolidated Statements of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock Par	Common Stock Additional Paid-In Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Shares
Balance at Dec. 31, 2009	$ 575.6	$ 1.0	$ 535.3	$ 71.0	$ (7.0)	$ (24.7)
Increase (Decrease) in Stockholders' Equity
Net income	77.4			77.4
Currency translation adjustments	(17.1)				(17.1)
Net unrealized gain (loss) on financial instruments, net of tax	1.7				1.7
Change in post-retirement benefit plans, net of tax	7.3				7.3
Comprehensive income	69.3
Activity under stock plans	14.5		17.0			(2.5)
Balance at Dec. 31, 2010	659.4	1.0	552.3	148.4	(15.1)	(27.2)
Increase (Decrease) in Stockholders' Equity
Net income	135.5			135.5
Currency translation adjustments	(10.1)				(10.1)
Net unrealized gain (loss) on financial instruments, net of tax	(9.6)				(9.6)
Change in post-retirement benefit plans, net of tax	(5.0)				(5.0)
Comprehensive income	110.8
Activity under stock plans	32.0		36.9			(4.9)
Balance at Dec. 31, 2011	802.2	1.0	589.2	283.9	(39.8)	(32.1)
Increase (Decrease) in Stockholders' Equity
Net income	164.3			164.3
Currency translation adjustments	11.7				11.7
Net unrealized gain (loss) on financial instruments, net of tax	7.0				7.0
Change in post-retirement benefit plans, net of tax	(10.8)				(10.8)
Comprehensive income	172.2
Activity under stock plans	19.7		27.8			(8.1)
Balance at Dec. 31, 2012	$ 994.1	$ 1.0	$ 617.0	$ 448.2	$ (31.9)	$ (40.2)