Business Segment Information - Net Sales to External Customers and Long-lived Assets, by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	$ 328.1	$ 309.2	$ 638.5	$ 594.6
Total long-lived assets, net	253.9		253.9		$ 260.8
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	137.1	137.0	258.2	264.2
Total long-lived assets, net	65.3		65.3		67.9
CZECH REPUBLIC
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets, net	38.5		38.5		48.2
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets, net	29.5		29.5		31.0
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	48.6	39.7	89.6	66.9
Total long-lived assets, net	49.5		49.5		48.1
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	31.9	24.5	67.9	52.1
Total long-lived assets, net	35.7		35.7		27.5
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	110.5	$ 108.0	222.8	$ 211.4
Total long-lived assets, net	$ 35.4		$ 35.4		$ 38.1