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Intangible assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Cost    
Intangible assets, gross $ 832.1 $ 832.1
Finite-lived intangible assets, accumulated amortization 199.0 169.0
Intangible assets, net 633.1 663.1
Products    
Cost    
Intangible assets, gross 798.0 798.0
Finite-lived intangible assets, accumulated amortization 165.6 137.8
Intangible assets, net $ 632.4 660.2
Products | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Amortization period of intangible asset 9 years  
Products | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Amortization period of intangible asset 22 years  
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Amortization period of intangible asset 8 years  
Cost    
Intangible assets, gross $ 28.6 28.6
Finite-lived intangible assets, accumulated amortization 28.3 26.5
Intangible assets, net $ 0.3 2.1
CDMO    
Finite-Lived Intangible Assets [Line Items]    
Amortization period of intangible asset 8 years  
Cost    
Intangible assets, gross $ 5.5 5.5
Finite-lived intangible assets, accumulated amortization 5.1 4.7
Intangible assets, net $ 0.4 $ 0.8