Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Noncontrolling interests
Balance at beginning of period	$ 6.9	$ 7.0	$ 6.7	$ 6.8
Net income	0.6	0.3	0.7	0.3
Foreign currency translation adjustments	0.4	(0.2)	0.5
Cash payments to noncontrolling interest	(0.5)		(0.5)
Balance at end of period	$ 7.4	$ 7.1	$ 7.4	$ 7.1