Segment Information - By Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sales Revenue, Goods, Net [Abstract]
Net sales	$ 319.3	$ 290.2	$ 934.8	$ 874.7
Reportable Geographical Components | United States
Sales Revenue, Goods, Net [Abstract]
Net sales	196.3	181.4	573.5	522.4
Reportable Geographical Components | France
Sales Revenue, Goods, Net [Abstract]
Net sales	114.9	94.4	337.5	298.2
Reportable Geographical Components | Other Europe
Sales Revenue, Goods, Net [Abstract]
Net sales	0.0	7.5	0.0	33.9
Reportable Geographical Components | Other North America
Sales Revenue, Goods, Net [Abstract]
Net sales	$ 8.1	$ 6.9	$ 23.8	$ 20.2