Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Noncontrolling interests
Balance at beginning of period	$ 7.1	$ 6.6	$ 6.8	$ 5.8
Net income	0.5	1.1	0.8	2.7
Foreign currency translation adjustments	0.1		0.1	(0.3)
Cash payments to noncontrolling interest	(0.7)		(0.7)	(0.5)
Balance at end of period	$ 7.0	$ 7.7	$ 7.0	$ 7.7