Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Noncontrolling interest
Balance at the beginning of period	$ 2.9	$ 3.3	$ 3.4	$ 2.7
Net income	0.2	0.3	0.2	1.2
Foreign currency translation adjustment	(0.1)			0.1
Cash payment to noncontrolling interest			(0.6)	(0.4)
Balance at the end of period	$ 3.0	$ 3.6	$ 3.0	$ 3.6