Segment Information (Sales and PPE by Geographic Location) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,717.4	$ 1,599.1	$ 1,509.1
Property, plant and equipment, net	822.0	855.0	778.3
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	766.1	734.6	738.3
Property, plant and equipment, net	315.3	323.8	329.3
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	235.9	226.4	200.6
Property, plant and equipment, net	99.3	108.8	96.8
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	127.5	125.6	116.3
Property, plant and equipment, net	42.5	43.1	37.1
Other European countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	386.1	318.5	268.3
Property, plant and equipment, net	232.5	244.9	192.3
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	201.8	194.0	185.6
Property, plant and equipment, net	$ 132.4	$ 134.4	$ 122.8