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Revenue Recognition (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
revenue_source
Mar. 31, 2020
USD ($)
Revenue from Contract with Customer [Abstract]    
Number of revenue sources | revenue_source 2  
Revenue from External Customer [Line Items]    
Total revenues $ 288.2 $ 261.5
United States    
Revenue from External Customer [Line Items]    
Total revenues 143.1 127.2
Europe and the former Commonwealth of Independent States    
Revenue from External Customer [Line Items]    
Total revenues 67.2 56.1
Asia/Pacific (including China)    
Revenue from External Customer [Line Items]    
Total revenues 54.6 49.5
Latin America    
Revenue from External Customer [Line Items]    
Total revenues 11.2 13.3
Other foreign countries    
Revenue from External Customer [Line Items]    
Total revenues 12.1 15.4
Product revenues    
Revenue from External Customer [Line Items]    
Total revenues 267.3 241.7
Materials conversion revenues    
Revenue from External Customer [Line Items]    
Total revenues 17.4 16.7
Other revenues    
Revenue from External Customer [Line Items]    
Total revenues 3.5 3.1
AMS    
Revenue from External Customer [Line Items]    
Total revenues 163.0 122.9
AMS | United States    
Revenue from External Customer [Line Items]    
Total revenues 105.7 83.3
AMS | Europe and the former Commonwealth of Independent States    
Revenue from External Customer [Line Items]    
Total revenues 17.8 12.6
AMS | Asia/Pacific (including China)    
Revenue from External Customer [Line Items]    
Total revenues 32.4 20.7
AMS | Latin America    
Revenue from External Customer [Line Items]    
Total revenues 2.4 2.3
AMS | Other foreign countries    
Revenue from External Customer [Line Items]    
Total revenues 4.7 4.0
AMS | Product revenues    
Revenue from External Customer [Line Items]    
Total revenues 158.3 117.0
AMS | Materials conversion revenues    
Revenue from External Customer [Line Items]    
Total revenues 2.3 3.8
AMS | Other revenues    
Revenue from External Customer [Line Items]    
Total revenues 2.4 2.1
EP    
Revenue from External Customer [Line Items]    
Total revenues 125.2 138.6
EP | United States    
Revenue from External Customer [Line Items]    
Total revenues 37.4 43.9
EP | Europe and the former Commonwealth of Independent States    
Revenue from External Customer [Line Items]    
Total revenues 49.4 43.5
EP | Asia/Pacific (including China)    
Revenue from External Customer [Line Items]    
Total revenues 22.2 28.8
EP | Latin America    
Revenue from External Customer [Line Items]    
Total revenues 8.8 11.0
EP | Other foreign countries    
Revenue from External Customer [Line Items]    
Total revenues 7.4 11.4
EP | Product revenues    
Revenue from External Customer [Line Items]    
Total revenues 109.0 124.7
EP | Materials conversion revenues    
Revenue from External Customer [Line Items]    
Total revenues 15.1 12.9
EP | Other revenues    
Revenue from External Customer [Line Items]    
Total revenues $ 1.1 $ 1.0