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Segment information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues:        
Total revenues $ 337.9 $ 242.7 $ 503.0 $ 550.2
Less: Cost of sales:        
Cost of goods and services sold 190.6 169.8 345.7 325.7
Consolidated gross profit 140.7 65.6 144.2 207.6
Products:        
Changes in fair value of contingent consideration     1.9 1.8
Adjusted Gross Margin 143.0 66.9 150.0 209.4
Other reconciling items:        
Adjustments to gross margin (2.3) (1.3) (5.8) (1.8)
Impairment of long-lived assets (306.7) 0.0 (306.7) 0.0
Research and development (26.0) (49.8) (66.6) (96.2)
Selling, general and administrative (91.4) (81.1) (191.9) (165.9)
Amortization of intangible assets (16.1) (14.0) (33.1) (28.0)
Interest expense (28.6) (7.8) (46.5) (16.0)
Gain on sale of business 74.9 0.0 74.9 0.0
Other, net (3.6) (3.0) 1.3 (5.0)
Loss before income taxes (250.2) (82.8) (411.3) (86.6)
Contracts and grants        
Revenues:        
Revenue 6.6 7.3 13.1 16.9
Products And Services Segments        
Revenues:        
Revenue 331.3 235.4 489.9 533.3
Products        
Revenues:        
Revenue 302.2 237.2 445.6 474.3
Less: Cost of sales:        
Cost of goods and services sold 134.9 91.0 237.8 171.3
Consolidated gross profit 167.3 146.2 207.8 303.0
Products:        
Changes in fair value of contingent consideration 0.4 1.3 1.9 1.8
Restructuring costs 0.0 0.0 2.0 0.0
Inventory step-up provision 1.9 0.0 1.9 0.0
Adjusted Gross Margin 169.6 147.5 213.6 304.8
Services        
Revenues:        
Revenue 29.1 (1.8) 44.3 59.0
Less: Cost of sales:        
Cost of goods and services sold 55.7 78.8 107.9 154.4
Consolidated gross profit (26.6) (80.6) (63.6) (95.4)
Products:        
Adjusted Gross Margin $ (26.6) $ (80.6) $ (63.6) $ (95.4)