Segment Information by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales [Abstract]
Net sales	$ 313.0	$ 297.7	$ 615.5	$ 584.5
Reportable Geographical Components [Member] | United States [Member]
Net sales [Abstract]
Net sales	194.6	175.4	377.2	341.0
Reportable Geographical Components [Member] | France [Member]
Net sales [Abstract]
Net sales	110.3	103.7	222.6	203.8
Reportable Geographical Components [Member] | Other Europe [Member]
Net sales [Abstract]
Net sales	0.0	11.3	0.0	26.4
Reportable Geographical Components [Member] | Other North America [Member]
Net sales [Abstract]
Net sales	$ 8.1	$ 7.3	$ 15.7	$ 13.3