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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, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenues:            
Total revenues $ 293.8   $ 270.5   $ 848.9 $ 772.7
Cost of sales or services:            
Cost of goods and services sold 122.6   176.8   563.3 520.3
Gross margin $ 161.2   $ 87.2   $ 261.0 $ 232.8
Gross margin % 57.00%   33.00%   32.00% 31.00%
Segment adjusted gross margin $ 167.4   $ 99.2   $ 380.8 $ 249.4
Reconciling items:            
Segment restructuring costs (6.3)   (20.3)   (22.9) (29.9)
Segment inventory step-up provision (1.2)   0.0   (1.2) (1.9)
Segment changes in fair value of financial instruments 0.0   1.1   (0.6) 0.4
Segment settlement charge, net 0.0   0.0   (110.2) 0.0
Goodwill impairment 0.0   (218.2)   0.0 (218.2)
Impairment of long-lived assets 0.0 $ (27.2) 0.0 $ (306.7) (27.2) (306.7)
Research and development (13.8)   (15.3)   (61.6) (82.0)
Selling, general and administrative (76.6)   (86.0)   (247.2) (278.7)
Amortization of intangible assets (16.3)   (16.3)   (48.8) (49.4)
Interest expense (8.3)   (19.7)   (56.2) (66.2)
Gain (loss) on sale of business 64.3   (0.7)   24.3 74.2
Other, net 21.9   (3.4)   15.8 (2.1)
Income (loss) before income taxes 142.4   (265.9)   (115.3) (676.7)
Operating Segments            
Revenues:            
Revenue 283.8   264.0   824.3 753.1
Reconciling items:            
Segment restructuring costs (5.0)   (13.1)   (7.8) (15.1)
Contracts and grants            
Revenues:            
Revenue 10.0   6.5   24.6 19.6
Reconciling items:            
Contracts and grants revenue 10.0   6.5   24.6 19.6
Contracts and grants | Contracts and grants revenue            
Revenues:            
Revenue 10.0   6.5   24.6 19.6
Reconciling items:            
Contracts and grants revenue 10.0   6.5   24.6 19.6
Commercial Products            
Cost of sales or services:            
Cost of goods and services sold 47.2   60.0   152.7 160.2
Gross margin $ 48.1   $ 82.1   $ 181.1 $ 226.0
Gross margin % 50.00%   58.00%   54.00% 59.00%
Segment adjusted gross margin $ 48.1   $ 82.1   $ 181.1 $ 226.0
Commercial Products | Operating Segments            
Revenues:            
Revenue 95.3   142.1   333.8 386.2
Reconciling items:            
Contracts and grants revenue 95.3   142.1   333.8 386.2
Segment restructuring costs 0.0   0.0   0.0 0.0
MCM Products            
Cost of sales or services:            
Cost of goods and services sold 54.0   72.5   147.3 208.4
Gross margin $ 120.2   $ 35.2   $ 245.7 $ 100.8
Gross margin % 69.00%   33.00%   63.00% 33.00%
Segment adjusted gross margin $ 126.3   $ 39.1   $ 255.0 $ 109.3
MCM Products | Operating Segments            
Revenues:            
Revenue 174.2   107.7   393.0 309.2
Reconciling items:            
Contracts and grants revenue 174.2   107.7   393.0 309.2
Segment restructuring costs (4.9)   (5.0)   (7.5) (7.0)
Services            
Cost of sales or services:            
Cost of goods and services sold 21.4   44.3   263.3 151.7
Gross margin $ (7.1)   $ (30.1)   $ (165.8) $ (94.0)
Gross margin % (50.00%)   (212.00%)   (170.00%) (163.00%)
Segment adjusted gross margin $ (7.0)   $ (22.0)   $ (55.3) $ (85.9)
Services | Operating Segments            
Revenues:            
Revenue 14.3   14.2   97.5 57.7
Reconciling items:            
Segment restructuring costs $ (0.1)   $ (8.1)   $ (0.3) $ (8.1)