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Segment information - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues [Abstract]    
Total revenues $ 300.4 $ 164.3
Cost of sales or services:    
Cost of goods and services sold 144.6 152.9
Gross margin $ 147.8 $ 4.9
Gross margin % 51.00% 3.00%
Segment adjusted gross margin $ 148.0 $ 7.2
Reconciling items:    
Segment restructuring costs 0.5 (9.7)
Changes in fair value of contingent consideration (0.5) (0.3)
Research and development (15.1) (40.7)
Selling, general and administrative (84.7) (101.3)
Amortization of intangible assets (16.2) (17.0)
Interest expense (24.3) (17.9)
Other, net (3.4) 4.9
Income (loss) before income taxes 12.1 (160.6)
Operating Segments    
Revenues [Abstract]    
Revenue 292.4 157.8
Reconciling items:    
Segment restructuring costs 0.3 (2.0)
Contracts and grants    
Revenues [Abstract]    
Revenue 8.0 6.5
Reconciling items:    
Contracts and grants revenue 8.0 6.5
Contracts and grants | Contracts and grants revenue    
Revenues [Abstract]    
Revenue 8.0 6.5
Reconciling items:    
Contracts and grants revenue 8.0 6.5
Commercial Products    
Cost of sales or services:    
Cost of goods and services sold 52.1 45.8
Gross margin $ 66.4 $ 60.4
Gross margin % 56.00% 57.00%
Segment adjusted gross margin $ 66.4 $ 60.4
Commercial Products | Operating Segments    
Revenues [Abstract]    
Revenue 118.5 106.2
Reconciling items:    
Contracts and grants revenue 118.5 106.2
Segment restructuring costs 0.0 0.0
MCM Products    
Cost of sales or services:    
Cost of goods and services sold 62.2 55.4
Gross margin $ 93.2 $ (18.2)
Gross margin % 60.00% (49.00%)
Segment adjusted gross margin $ 93.6 $ (15.9)
MCM Products | Operating Segments    
Revenues [Abstract]    
Revenue 155.4 37.2
Reconciling items:    
Contracts and grants revenue 155.4 37.2
Segment restructuring costs 0.1 (2.0)
Services    
Cost of sales or services:    
Cost of goods and services sold 30.3 51.7
Gross margin $ (11.8) $ (37.3)
Gross margin % (64.00%) (259.00%)
Segment adjusted gross margin $ (12.0) $ (37.3)
Services | Operating Segments    
Revenues [Abstract]    
Revenue 18.5 14.4
Reconciling items:    
Segment restructuring costs $ 0.2 $ 0.0