Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Noncontrolling interest
Balance at the beginning of period	$ 3.4	$ 2.7
Net income		0.4
Foreign currency translation adjustment	0.1	0.1
Balance at the end of period	$ 3.5	$ 3.2