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Intangible assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Cost $ 803.5 $ 803.5
Accumulated Amortization 226.9 198.9
Net 576.6 604.6
Products    
Finite-Lived Intangible Assets [Line Items]    
Cost 798.0 798.0
Accumulated Amortization 221.4 193.5
Net $ 576.6 604.5
Products | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 9 years  
Products | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 22 years  
CDMO    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 8 years  
Cost $ 5.5 5.5
Accumulated Amortization 5.5 5.4
Net $ 0.0 $ 0.1