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Segment information - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues:                
Total revenues $ 270.5 $ 337.9 $ 164.3 $ 239.9 $ 242.6 $ 304.8 $ 772.7 $ 787.3
Less: Cost of sales:                
Cost of goods and services sold 176.8     147.2     520.3 472.6
Consolidated gross margin 87.2     75.3     232.8 280.4
Products:                
Changes in fair value of contingent consideration             (0.4) 2.4
Restructuring costs 20.3           29.9  
Services:                
Restructuring costs 20.3           29.9  
Adjusted Gross Margin 99.2     75.9     249.4 282.8
Other reconciling items:                
Adjustments to gross margin (12.0)     (0.6)     (16.6) (2.4)
Goodwill impairment (218.2)     0.0     (218.2) 0.0
Impairment of long-lived assets 0.0     0.0     (306.7) 0.0
Research and development (15.3)     (42.2)     (82.0) (141.3)
Selling, general and administrative (86.0)     (81.8)     (278.7) (246.1)
Amortization of intangible assets (16.3)     (14.0)     (49.4) (42.0)
Interest expense (19.7)     (8.5)     (66.2) (24.5)
Gain on sale of business (0.7)     0.0     74.2 0.0
Other, net (3.4)     (13.4)     (2.1) (18.4)
Loss before income taxes (265.9)     (67.2)     (676.7) (157.6)
Contracts and grants                
Revenues:                
Revenue 6.5     17.4     19.6 34.3
Products And Services Segments                
Revenues:                
Revenue 264.0     222.5     753.1 753.0
Products                
Revenues:                
Revenue 249.8     186.2     695.4 660.5
Less: Cost of sales:                
Cost of goods and services sold 132.5     85.2     368.6 256.8
Consolidated gross margin 117.3     101.0     326.8 403.7
Products:                
Changes in fair value of contingent consideration (1.1)     0.6     (0.4) 2.4
Restructuring costs 5.0     0.0     7.0 0.0
Inventory step-up provision 0.0     0.0     1.9 0.0
Services:                
Restructuring costs 5.0     0.0     7.0 0.0
Adjusted Gross Margin 121.2     101.6     335.3 406.1
Other reconciling items:                
Goodwill impairment (218.2)              
Services                
Revenues:                
Revenue 14.2     36.3     57.7 92.5
Less: Cost of sales:                
Cost of goods and services sold 44.3     62.0     151.7 215.8
Consolidated gross margin (30.1)     (25.7)     (94.0) (123.3)
Products:                
Restructuring costs 8.1     0.0     8.1 0.0
Services:                
Restructuring costs 8.1     0.0     8.1 0.0
Adjusted Gross Margin $ (22.0)     $ (25.7)     (85.9) $ (123.3)
Other reconciling items:                
Goodwill impairment             $ 0.0