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Revenue Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from External Customer [Line Items]        
Total revenues $ 269.9 $ 270.4 $ 527.9 $ 532.3
United States        
Revenue from External Customer [Line Items]        
Total revenues 138.3 134.8 269.0 262.6
Europe and the former Commonwealth of Independent States        
Revenue from External Customer [Line Items]        
Total revenues 54.4 70.7 112.7 144.1
Asia/Pacific (including China)        
Revenue from External Customer [Line Items]        
Total revenues 48.0 39.9 85.6 75.8
Latin America        
Revenue from External Customer [Line Items]        
Total revenues 13.8 13.0 26.9 27.7
Other foreign countries        
Revenue from External Customer [Line Items]        
Total revenues 15.4 12.0 33.7 22.1
Product revenues        
Revenue from External Customer [Line Items]        
Total revenues 251.0 254.2 489.7 483.4
Materials conversion revenues        
Revenue from External Customer [Line Items]        
Total revenues 15.8 13.7 32.6 44.6
Other revenues        
Revenue from External Customer [Line Items]        
Total revenues 3.1 2.5 5.6 4.3
AMS        
Revenue from External Customer [Line Items]        
Total revenues 126.7 124.0 247.2 239.3
AMS | United States        
Revenue from External Customer [Line Items]        
Total revenues 87.4 84.8 170.7 162.9
AMS | Europe and the former Commonwealth of Independent States        
Revenue from External Customer [Line Items]        
Total revenues 13.4 10.7 26.6 26.5
AMS | Asia/Pacific (including China)        
Revenue from External Customer [Line Items]        
Total revenues 20.5 22.0 37.7 36.6
AMS | Latin America        
Revenue from External Customer [Line Items]        
Total revenues 1.5 2.5 3.5 5.7
AMS | Other foreign countries        
Revenue from External Customer [Line Items]        
Total revenues 3.9 4.0 8.7 7.6
AMS | Product revenues        
Revenue from External Customer [Line Items]        
Total revenues 122.7 120.6 240.2 229.0
AMS | Materials conversion revenues        
Revenue from External Customer [Line Items]        
Total revenues 2.0 2.2 3.9 8.4
AMS | Other revenues        
Revenue from External Customer [Line Items]        
Total revenues 2.0 1.2 3.1 1.9
EP        
Revenue from External Customer [Line Items]        
Total revenues 143.2 146.4 280.7 293.0
EP | United States        
Revenue from External Customer [Line Items]        
Total revenues 50.9 50.0 98.3 99.7
EP | Europe and the former Commonwealth of Independent States        
Revenue from External Customer [Line Items]        
Total revenues 41.0 60.0 86.1 117.6
EP | Asia/Pacific (including China)        
Revenue from External Customer [Line Items]        
Total revenues 27.5 17.9 47.9 39.2
EP | Latin America        
Revenue from External Customer [Line Items]        
Total revenues 12.3 10.5 23.4 22.0
EP | Other foreign countries        
Revenue from External Customer [Line Items]        
Total revenues 11.5 8.0 25.0 14.5
EP | Product revenues        
Revenue from External Customer [Line Items]        
Total revenues 128.3 133.6 249.5 254.4
EP | Materials conversion revenues        
Revenue from External Customer [Line Items]        
Total revenues 13.8 11.5 28.7 36.2
EP | Other revenues        
Revenue from External Customer [Line Items]        
Total revenues $ 1.1 $ 1.3 $ 2.5 $ 2.4