Revenue Recognition (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) revenue_source	Mar. 31, 2019 USD ($)
Revenue from External Customer [Line Items]
Number of revenue sources | revenue_source	2
Total revenues	$ 261.5	$ 258.0
United States
Revenue from External Customer [Line Items]
Total revenues	127.2	130.7
Europe and the former Commonwealth of Independent States
Revenue from External Customer [Line Items]
Total revenues	56.1	58.3
Asia/Pacific (including China)
Revenue from External Customer [Line Items]
Total revenues	49.5	37.6
Latin America
Revenue from External Customer [Line Items]
Total revenues	13.3	13.1
Other foreign countries
Revenue from External Customer [Line Items]
Total revenues	15.4	18.3
Product revenues
Revenue from External Customer [Line Items]
Total revenues	241.7	238.7
Materials conversion revenues
Revenue from External Customer [Line Items]
Total revenues	16.7	16.8
Other revenues
Revenue from External Customer [Line Items]
Total revenues	3.1	2.5
AMS
Revenue from External Customer [Line Items]
Total revenues	122.9	120.5
AMS | United States
Revenue from External Customer [Line Items]
Total revenues	83.3	83.3
AMS | Europe and the former Commonwealth of Independent States
Revenue from External Customer [Line Items]
Total revenues	12.6	13.2
AMS | Asia/Pacific (including China)
Revenue from External Customer [Line Items]
Total revenues	20.7	17.2
AMS | Latin America
Revenue from External Customer [Line Items]
Total revenues	2.3	2.0
AMS | Other foreign countries
Revenue from External Customer [Line Items]
Total revenues	4.0	4.8
AMS | Product revenues
Revenue from External Customer [Line Items]
Total revenues	117.0	117.5
AMS | Materials conversion revenues
Revenue from External Customer [Line Items]
Total revenues	3.8	1.9
AMS | Other revenues
Revenue from External Customer [Line Items]
Total revenues	2.1	1.1
EP
Revenue from External Customer [Line Items]
Total revenues	138.6	137.5
EP | United States
Revenue from External Customer [Line Items]
Total revenues	43.9	47.4
EP | Europe and the former Commonwealth of Independent States
Revenue from External Customer [Line Items]
Total revenues	43.5	45.1
EP | Asia/Pacific (including China)
Revenue from External Customer [Line Items]
Total revenues	28.8	20.4
EP | Latin America
Revenue from External Customer [Line Items]
Total revenues	11.0	11.1
EP | Other foreign countries
Revenue from External Customer [Line Items]
Total revenues	11.4	13.5
EP | Product revenues
Revenue from External Customer [Line Items]
Total revenues	124.7	121.2
EP | Materials conversion revenues
Revenue from External Customer [Line Items]
Total revenues	12.9	14.9
EP | Other revenues
Revenue from External Customer [Line Items]
Total revenues	$ 1.0	$ 1.4