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Revenue recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 222.2	$ 300.4
USG
Disaggregation of Revenue [Line Items]
Revenue	78.8	121.8
Non-USG
Disaggregation of Revenue [Line Items]
Revenue	143.4	178.6
Commercial Product sales
Disaggregation of Revenue [Line Items]
Revenue	45.3	118.5
Commercial Product sales | USG
Disaggregation of Revenue [Line Items]
Revenue	0.1	0.3
Commercial Product sales | Non-USG
Disaggregation of Revenue [Line Items]
Revenue	45.2	118.2
MCM Product sales
Disaggregation of Revenue [Line Items]
Revenue	156.6	155.4
MCM Product sales | USG
Disaggregation of Revenue [Line Items]
Revenue	66.6	114.1
MCM Product sales | Non-USG
Disaggregation of Revenue [Line Items]
Revenue	90.0	41.3
All other revenue
Disaggregation of Revenue [Line Items]
Revenue	20.3	26.5
All other revenue | USG
Disaggregation of Revenue [Line Items]
Revenue	12.1	7.4
All other revenue | Non-USG
Disaggregation of Revenue [Line Items]
Revenue	$ 8.2	$ 19.1

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