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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Revenues:          
Revenue $ 140.9 $ 254.7 $ 363.1 $ 555.1  
Cost of sales reportable segments:          
Cost of goods and services sold [1] 66.9 296.1 155.4 440.7  
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]          
Amortization of intangible assets (16.2) (16.3) (32.5) (32.5)  
Changes in fair value of financial instruments     0.0 (0.6)  
Impairment of long-lived assets 0.0 (27.2) 0.0 (27.2) $ (27.2)
Research and development (12.5) (32.7) (27.6) (47.8)  
Selling, general and administrative (43.7) (85.9) (96.1) (170.6)  
Interest expense (14.7) (23.6) (29.4) (47.9)  
Other, net (3.7) (2.7) 66.0 (6.1)  
Income (loss) before income taxes (16.8) (269.8) 75.9 (257.7)  
Restructuring costs (1.1) 17.1 (2.4) 16.6  
Operating Segments          
Revenues:          
Revenue 125.9 183.4 327.8 457.3  
Cost of sales reportable segments:          
Cost of goods and services sold 62.4 81.7 136.1 195.6  
Segment adjusted gross margin reportable segments: 63.5 101.7 191.7 261.7  
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]          
All other revenues less other costs of revenue 10.3 (140.3) 16.8 (144.1)  
Amortization of intangible assets (16.2) (16.3) (32.5) (32.5)  
Restructuring costs 0.2 (2.7) 1.0 (2.6)  
Inventory step-up provision 0.0 0.0 (1.8) 0.0  
Changes in fair value of financial instruments 0.0 (0.1) 0.0 (0.6)  
Impairment of long-lived assets 0.0 (27.2) 0.0 (27.2)  
Research and development (12.5) (32.7) (27.6) (47.8)  
Selling, general and administrative (43.7) (85.9) (96.1) (170.6)  
Interest expense (14.7) (23.6) (29.4) (47.9)  
Loss on assets held for sale 0.0 (40.0) (12.2) (40.0)  
Other, net (3.7) (2.7) 66.0 (6.1)  
Income (loss) before income taxes (16.8) (269.8) 75.9 (257.7)  
Restructuring costs (0.3) 3.1 (1.2) 2.8  
All other revenues          
Revenues:          
Revenue 15.0 71.3 35.3 97.8  
Commercial Products | Operating Segments          
Revenues:          
Revenue 67.5 120.0 112.8 238.5  
Cost of sales reportable segments:          
Cost of goods and services sold 36.2 53.4 60.7 105.5  
Segment adjusted gross margin reportable segments: 31.3 66.6 52.1 133.0  
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]          
Restructuring costs 0.2   0.2    
MCM Products | Operating Segments          
Revenues:          
Revenue 58.4 63.4 215.0 218.8  
Cost of sales reportable segments:          
Cost of goods and services sold 26.2 28.3 75.4 90.1  
Segment adjusted gross margin reportable segments: 32.2 35.1 139.6 128.7  
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]          
Inventory step-up provision     (1.8)    
Changes in fair value of financial instruments   (0.1)   (0.6)  
Restructuring costs $ (0.4) $ 2.7 $ (1.2) $ 2.6  
[1]
(1) Exclusive of intangible asset amortization