Consolidated Statements of Equity (unaudited) (USD $) In Millions, unless otherwise specified	Total	Common Stock and Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2011	$ 167.5	$ 473.6	$ 301.1	$ (36.8)	$ (578.5)	$ 8.1
Increase (Decrease) in Stockholders' Equity
Net income	61.3		60.9			0.4
Stock plan activity	14.3	6.2		8.1
Other comprehensive income	16.3				16.2	0.1
Balance at Mar. 31, 2012	259.4	479.8	362.0	(28.7)	(562.3)	8.6
Balance at Dec. 31, 2012	318.3	537.3	395.2	(16.8)	(607.3)	9.9
Increase (Decrease) in Stockholders' Equity
Net income	53.2		52.9			0.3
Stock plan activity	9.8	6.2		3.6
Other comprehensive income	30.3				30.1	0.2
Balance at Mar. 31, 2013	$ 411.6	$ 543.5	$ 448.1	$ (13.2)	$ (577.2)	$ 10.4