Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Noncontrolling interest
Balance at the beginning of period	$ 3.5	$ 3.2	$ 3.4	$ 2.7
Net income		0.5		0.9
Foreign currency translation adjustment		0.1	0.1	0.2
Cash payment to noncontrolling interest	(0.6)	(0.4)	(0.6)	(0.4)
Balance at the end of period	$ 2.9	$ 3.4	$ 2.9	$ 3.4