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Segment information - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenues:          
Total revenues $ 254.7 $ 337.9 $ 555.1 $ 502.2  
Cost of sales or services:          
Cost of goods and services sold 296.1 190.6 440.7 343.5  
Gross margin $ (48.0) $ 140.7 $ 99.8 $ 145.6  
Gross margin % (19.00%) 42.00% 18.00% 30.00%  
Segment adjusted gross margin $ 65.4 $ 143.0 $ 213.4 $ 150.2  
Reconciling items:          
Segment restructuring costs (17.1) 0.1 (16.6) (9.6)  
Segment inventory step-up provision 0.0 (1.9) 0.0 (1.9)  
Changes in fair value of contingent consideration (0.1) (0.4) (0.6) (0.7)  
Settlement charge, net (110.2) 0.0 (110.2) 0.0  
Impairment of long-lived assets (27.2) (306.7) (27.2) (306.7)  
Research and development (32.7) (26.0) (47.8) (66.7)  
Selling, general and administrative (85.9) (91.4) (170.6) (192.7)  
Amortization of intangible assets (16.3) (16.1) (32.5) (33.1)  
Interest expense (23.6) (28.6) (47.9) (46.5)  
Gain (loss) on sale of business and assets held for sale (40.0) 74.9 (40.0) 74.9 $ 74.2
Other, net (2.7) (3.6) (6.1) 1.3  
Loss before income taxes (269.8) (250.2) (257.7) (410.8)  
Operating Segments          
Revenues:          
Revenue 248.1 331.3 540.5 489.1  
Reconciling items:          
Segment restructuring costs (3.1) 0.0 (2.8) (2.0)  
Contracts and grants          
Revenues:          
Revenue 6.6 6.6 14.6 13.1  
Reconciling items:          
Contracts and grants revenue 6.6 6.6 14.6 13.1  
Contracts and grants | Contracts and grants revenue          
Revenues:          
Revenue 6.6 6.6 14.6 13.1  
Reconciling items:          
Contracts and grants revenue 6.6 6.6 14.6 13.1  
Commercial Products          
Cost of sales or services:          
Cost of goods and services sold 53.4 54.4 105.5 100.2  
Gross margin $ 66.6 $ 83.5 $ 133.0 $ 143.9  
Gross margin % 56.00% 61.00% 56.00% 59.00%  
Segment adjusted gross margin $ 66.6 $ 83.5 $ 133.0 $ 143.9  
Commercial Products | Operating Segments          
Revenues:          
Revenue 120.0 137.9 238.5 244.1  
Reconciling items:          
Contracts and grants revenue 120.0 137.9 238.5 244.1  
Segment restructuring costs 0.0 0.0 0.0 0.0  
MCM Products          
Cost of sales or services:          
Cost of goods and services sold 31.1 80.5 93.3 135.9  
Gross margin $ 32.3 $ 83.8 $ 125.5 $ 65.6  
Gross margin % 51.00% 51.00% 57.00% 33.00%  
Segment adjusted gross margin $ 35.1 $ 86.1 $ 128.7 $ 70.2  
MCM Products | Operating Segments          
Revenues:          
Revenue 63.4 164.3 218.8 201.5  
Reconciling items:          
Contracts and grants revenue 63.4 164.3 218.8 201.5  
Segment restructuring costs (2.7) 0.0 (2.6) (2.0)  
Services          
Cost of sales or services:          
Cost of goods and services sold 211.6 55.7 241.9 107.4  
Gross margin $ (146.9) $ (26.6) $ (158.7) $ (63.9)  
Gross margin % (227.00%) (91.00%) (191.00%) (147.00%)  
Segment adjusted gross margin $ (36.3) $ (26.6) $ (48.3) $ (63.9)  
Services | Operating Segments          
Revenues:          
Revenue 64.7 29.1 83.2 43.5  
Reconciling items:          
Segment restructuring costs $ (0.4) $ 0.0 $ (0.2) $ 0.0