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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Total revenues	$ 248.7	$ 260.3	$ 270.4	$ 261.9	$ 235.7	$ 257.8	$ 255.3	$ 233.3	$ 1,041.3	$ 982.1	$ 839.9
AMS
Revenue from External Customer [Line Items]
Total revenues									467.9	433.2	280.6
EP
Revenue from External Customer [Line Items]
Total revenues									573.4	548.9	559.3
United States
Revenue from External Customer [Line Items]
Total revenues									513.4	468.9	372.2
United States | AMS
Revenue from External Customer [Line Items]
Total revenues									320.1	292.7	183.3
United States | EP
Revenue from External Customer [Line Items]
Total revenues									193.3	176.2	188.9
Europe and the former Commonwealth of Independent States
Revenue from External Customer [Line Items]
Total revenues									260.8	259.9	253.2
Europe and the former Commonwealth of Independent States | AMS
Revenue from External Customer [Line Items]
Total revenues									46.2	51.6	41.4
Europe and the former Commonwealth of Independent States | EP
Revenue from External Customer [Line Items]
Total revenues									214.6	208.3	211.8
Asia/Pacific (including China)
Revenue from External Customer [Line Items]
Total revenues									159.4	148.4	129.4
Asia/Pacific (including China) | AMS
Revenue from External Customer [Line Items]
Total revenues									76.6	66.1	43.4
Asia/Pacific (including China) | EP
Revenue from External Customer [Line Items]
Total revenues									82.8	82.3	86.0
Latin America
Revenue from External Customer [Line Items]
Total revenues									53.5	57.9	47.4
Latin America | AMS
Revenue from External Customer [Line Items]
Total revenues									10.0	9.4	6.2
Latin America | EP
Revenue from External Customer [Line Items]
Total revenues									43.5	48.5	41.2
Other foreign countries
Revenue from External Customer [Line Items]
Total revenues									54.2	47.0	37.7
Other foreign countries | AMS
Revenue from External Customer [Line Items]
Total revenues									15.0	13.4	6.3
Other foreign countries | EP
Revenue from External Customer [Line Items]
Total revenues									39.2	33.6	31.4
Product revenues
Revenue from External Customer [Line Items]
Total revenues									955.6	884.2	733.9
Product revenues | AMS
Revenue from External Customer [Line Items]
Total revenues									455.5	419.5	270.3
Product revenues | EP
Revenue from External Customer [Line Items]
Total revenues									500.1	464.7	463.6
Materials conversion revenues
Revenue from External Customer [Line Items]
Total revenues									76.6	90.7	96.0
Materials conversion revenues | AMS
Revenue from External Customer [Line Items]
Total revenues									8.4	11.4	9.7
Materials conversion revenues | EP
Revenue from External Customer [Line Items]
Total revenues									68.2	79.3	86.3
Other revenues
Revenue from External Customer [Line Items]
Total revenues									9.1	7.2	10.0
Other revenues | AMS
Revenue from External Customer [Line Items]
Total revenues									4.0	2.3	0.6
Other revenues | EP
Revenue from External Customer [Line Items]
Total revenues									$ 5.1	$ 4.9	$ 9.4

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