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Segment information - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:          
Total revenues     $ 1,043,600,000 $ 1,049,300,000 $ 1,117,500,000
Reconciliation to loss before income tax:          
Amortization of intangible assets     (65,100,000) (65,600,000) (59,900,000)
Restructuring costs     (22,500,000) (29,300,000)  
Changes in fair value of financial instruments     (600,000) (200,000) (2,600,000)
Goodwill impairment     0 (218,200,000) (6,700,000)
Impairment of long-lived assets $ (27,200,000) $ (306,700,000) (27,200,000) (306,700,000) 0
Research and development     (70,700,000) (111,400,000) (188,300,000)
Selling, general and administrative     (308,000,000.0) (368,400,000) (339,500,000)
Interest expense     (71,000,000.0) (87,900,000) (37,300,000)
Gain on sale of business     24,300,000 74,200,000 0
Other, net     12,500,000 8,900,000 (11,700,000)
Loss before income taxes     (142,900,000) (731,200,000) (219,000,000.0)
Operating Segments          
Less:          
Segment adjusted gross margin     456,700,000 335,700,000 437,000,000.0
Reconciliation to loss before income tax:          
Amortization of intangible assets     (65,100,000) (65,600,000) (59,900,000)
Restructuring costs     (7,400,000) (14,000,000.0) 0
Inventory step-up provision     (6,200,000) (3,900,000) (51,400,000)
Changes in fair value of financial instruments     (600,000) (200,000) (2,600,000)
Settlement charge, net     (110,200,000) 0 0
Goodwill impairment     0 (218,200,000) (6,700,000)
Impairment of long-lived assets     (27,200,000) (306,700,000) 0
Research and development     (70,700,000) (111,400,000) (188,300,000)
Selling, general and administrative     (308,000,000.0) (368,400,000) (339,500,000)
Interest expense     (71,000,000.0) (87,900,000) (37,300,000)
Gain on sale of business     24,300,000 74,200,000 0
Other, net     12,500,000 8,900,000 (11,700,000)
Loss before income taxes     (142,900,000) (731,200,000) (219,000,000.0)
Contracts and grants          
Revenues:          
Revenue     30,000,000.0 26,300,000 41,400,000
Reconciliation to loss before income tax:          
Contracts and grants revenue     30,000,000.0 26,300,000 41,400,000
Contracts and grants | Operating Segments          
Revenues:          
Revenue     30,000,000.0 26,300,000 41,400,000
Reconciliation to loss before income tax:          
Contracts and grants revenue     30,000,000.0 26,300,000 41,400,000
Contracts and grants | Contracts and grants revenue          
Revenues:          
Revenue     30,000,000.0 26,300,000 41,400,000
Reconciliation to loss before income tax:          
Contracts and grants revenue     30,000,000.0 26,300,000 41,400,000
Commercial Product sales | Operating Segments          
Revenues:          
Revenue     398,900,000 497,300,000 386,600,000
Less:          
Cost of goods and services sold     185,900,000 210,300,000 160,300,000
Segment adjusted gross margin     213,000,000.0 287,000,000.0 226,300,000
Reconciliation to loss before income tax:          
Contracts and grants revenue     398,900,000 497,300,000 386,600,000
Restructuring costs     0 0  
MCM Product sales | Operating Segments          
Revenues:          
Revenue     509,800,000 447,200,000 579,600,000
Less:          
Cost of goods and services sold     205,400,000 295,900,000 210,300,000
Segment adjusted gross margin     304,400,000 151,300,000 369,300,000
Reconciliation to loss before income tax:          
Contracts and grants revenue     509,800,000 447,200,000 579,600,000
Restructuring costs     (7,200,000) (5,600,000) 0
Inventory step-up provision     (6,200,000) (3,900,000) (51,400,000)
Changes in fair value of financial instruments     (600,000) (200,000) (2,600,000)
Services | Operating Segments          
Revenues:          
Services     104,900,000 78,500,000 109,900,000
Less:          
Cost of goods and services sold     165,600,000 181,100,000 268,500,000
Segment adjusted gross margin     (60,700,000) (102,600,000) (158,600,000)
Reconciliation to loss before income tax:          
Restructuring costs     (200,000) $ (8,400,000) $ 0
Settlement charge, net     $ (110,200,000)