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Segment and Geographic Information - Geographic Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information                      
Sales to external customers $ 342.4 $ 357.8 $ 309.6 $ 289.3 $ 290.1 $ 272.2 $ 277.9 $ 244.1 $ 1,299.1 $ 1,084.3 $ 842.9
Property, plant and equipment, net 404.6       361.1       404.6 361.1  
United States                      
Segment Reporting Information                      
Sales to external customers                 688.6 604.8 475.0
Property, plant and equipment, net 224.8       176.8       224.8 176.8  
Total Foreign                      
Segment Reporting Information                      
Sales to external customers                 610.5 479.5 367.9
Property, plant and equipment, net 179.8       184.3       179.8 184.3  
Italy                      
Segment Reporting Information                      
Property, plant and equipment, net 56.4       52.9       56.4 52.9  
China                      
Segment Reporting Information                      
Sales to external customers                 89.7 115.1 101.3
Property, plant and equipment, net 67.8       77.2       67.8 77.2  
Czech Republic                      
Segment Reporting Information                      
Property, plant and equipment, net 25.8       21.5       25.8 21.5  
Germany                      
Segment Reporting Information                      
Property, plant and equipment, net 15.6       12.9       15.6 12.9  
India                      
Segment Reporting Information                      
Property, plant and equipment, net 13.7       19.8       13.7 19.8  
Other foreign countries                      
Segment Reporting Information                      
Sales to external customers                 520.8 364.4 $ 266.6
Property, plant and equipment, net $ 0.5       $ 0.0       $ 0.5 $ 0.0