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Revenue Recognition (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
revenue_source
Jun. 30, 2020
USD ($)
Revenue from Contract with Customer [Abstract]        
Number of revenue sources | revenue_source     2  
Revenue from External Customer [Line Items]        
Total revenues $ 377.8 $ 254.2 $ 666.0 $ 515.7
United States        
Revenue from External Customer [Line Items]        
Total revenues 192.5 127.5 335.6 254.7
Europe and the former Commonwealth of Independent States        
Revenue from External Customer [Line Items]        
Total revenues 103.9 50.9 171.1 107.0
Asia/Pacific (including China)        
Revenue from External Customer [Line Items]        
Total revenues 52.0 49.7 106.6 99.2
Americas        
Revenue from External Customer [Line Items]        
Total revenues 20.2 16.8 35.7 33.5
Other foreign countries        
Revenue from External Customer [Line Items]        
Total revenues 9.2 9.3 17.0 21.3
Product revenues        
Revenue from External Customer [Line Items]        
Total revenues 359.2 237.0 626.5 478.7
Materials conversion revenues        
Revenue from External Customer [Line Items]        
Total revenues 15.3 15.1 32.7 31.8
Other revenues        
Revenue from External Customer [Line Items]        
Total revenues 3.3 2.1 6.8 5.2
AMS        
Revenue from External Customer [Line Items]        
Total revenues 252.0 132.8 415.0 255.7
AMS | United States        
Revenue from External Customer [Line Items]        
Total revenues 154.1 88.8 259.8 172.1
AMS | Europe and the former Commonwealth of Independent States        
Revenue from External Customer [Line Items]        
Total revenues 55.8 11.1 73.6 23.7
AMS | Asia/Pacific (including China)        
Revenue from External Customer [Line Items]        
Total revenues 28.5 25.7 60.9 46.4
AMS | Americas        
Revenue from External Customer [Line Items]        
Total revenues 9.1 5.3 13.5 9.2
AMS | Other foreign countries        
Revenue from External Customer [Line Items]        
Total revenues 4.5 1.9 7.2 4.3
AMS | Product revenues        
Revenue from External Customer [Line Items]        
Total revenues 246.1 127.1 404.4 244.1
AMS | Materials conversion revenues        
Revenue from External Customer [Line Items]        
Total revenues 3.6 5.0 5.9 8.8
AMS | Other revenues        
Revenue from External Customer [Line Items]        
Total revenues 2.3 0.7 4.7 2.8
EP        
Revenue from External Customer [Line Items]        
Total revenues 125.8 121.4 251.0 260.0
EP | United States        
Revenue from External Customer [Line Items]        
Total revenues 38.4 38.7 75.8 82.6
EP | Europe and the former Commonwealth of Independent States        
Revenue from External Customer [Line Items]        
Total revenues 48.1 39.8 97.5 83.3
EP | Asia/Pacific (including China)        
Revenue from External Customer [Line Items]        
Total revenues 23.5 24.0 45.7 52.8
EP | Americas        
Revenue from External Customer [Line Items]        
Total revenues 11.1 11.5 22.2 24.3
EP | Other foreign countries        
Revenue from External Customer [Line Items]        
Total revenues 4.7 7.4 9.8 17.0
EP | Product revenues        
Revenue from External Customer [Line Items]        
Total revenues 113.1 109.9 222.1 234.6
EP | Materials conversion revenues        
Revenue from External Customer [Line Items]        
Total revenues 11.7 10.1 26.8 23.0
EP | Other revenues        
Revenue from External Customer [Line Items]        
Total revenues $ 1.0 $ 1.4 $ 2.1 $ 2.4