Revenue Recognition - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Total revenues	$ 390.4	$ 383.6	$ 377.8	$ 288.2	$ 279.4	$ 279.3	$ 254.2	$ 261.5	$ 1,440.0	$ 1,074.4	$ 1,022.8
AMS
Revenue from External Customer [Line Items]
Total revenues									930.7	543.5	477.2
EP
Revenue from External Customer [Line Items]
Total revenues									509.3	530.9	545.6
U.S.
Revenue from External Customer [Line Items]
Total revenues									718.3	538.6	514.1
U.S. | AMS
Revenue from External Customer [Line Items]
Total revenues									562.5	376.7	331.3
U.S. | EP
Revenue from External Customer [Line Items]
Total revenues									155.8	161.9	182.8
Europe and the former Commonwealth of Independent States
Revenue from External Customer [Line Items]
Total revenues									383.3	229.7	218.4
Europe and the former Commonwealth of Independent States | AMS
Revenue from External Customer [Line Items]
Total revenues									193.8	47.5	45.8
Europe and the former Commonwealth of Independent States | EP
Revenue from External Customer [Line Items]
Total revenues									189.5	182.2	172.6
Asia/Pacific (including China)
Revenue from External Customer [Line Items]
Total revenues									211.1	205.3	172.6
Asia/Pacific (including China) | AMS
Revenue from External Customer [Line Items]
Total revenues									124.9	94.6	77.6
Asia/Pacific (including China) | EP
Revenue from External Customer [Line Items]
Total revenues									86.2	110.7	95.0
Americas (excluding U.S.)
Revenue from External Customer [Line Items]
Total revenues									77.9	52.9	53.2
Americas (excluding U.S.) | AMS
Revenue from External Customer [Line Items]
Total revenues									31.4	9.3	7.6
Americas (excluding U.S.) | EP
Revenue from External Customer [Line Items]
Total revenues									46.5	43.6	45.6
Other foreign countries
Revenue from External Customer [Line Items]
Total revenues									49.4	47.9	64.5
Other foreign countries | AMS
Revenue from External Customer [Line Items]
Total revenues									18.1	15.4	14.9
Other foreign countries | EP
Revenue from External Customer [Line Items]
Total revenues									$ 31.3	$ 32.5	$ 49.6