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Revenue recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 140.9	$ 254.7	$ 363.1	$ 555.1
Commercial Product sales
Disaggregation of Revenue [Line Items]
Revenue	67.5	120.0	112.8	238.5
MCM Product sales
Disaggregation of Revenue [Line Items]
Revenue	58.4	63.4	215.0	218.8
All other revenue
Disaggregation of Revenue [Line Items]
Revenue	15.0	71.3	35.3	97.8
USG
Disaggregation of Revenue [Line Items]
Revenue	57.8	37.3	136.6	159.1
USG | Commercial Product sales
Disaggregation of Revenue [Line Items]
Revenue	1.2	0.1	1.3	0.4
USG | MCM Product sales
Disaggregation of Revenue [Line Items]
Revenue	46.0	30.6	112.6	144.7
USG | All other revenue
Disaggregation of Revenue [Line Items]
Revenue	10.6	6.6	22.7	14.0
Non-USG
Disaggregation of Revenue [Line Items]
Revenue	83.1	217.4	226.5	396.0
Non-USG | Commercial Product sales
Disaggregation of Revenue [Line Items]
Revenue	66.3	119.9	111.5	238.1
Non-USG | MCM Product sales
Disaggregation of Revenue [Line Items]
Revenue	12.4	32.8	102.4	74.1
Non-USG | All other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 4.4	64.7	$ 12.6	83.8
Janssen Pharmaceuticals, Inc., | Service
Disaggregation of Revenue [Line Items]
Revenue		$ 50.0		$ 50.0

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