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Commitments and contingencies (Details) - USD ($)
$ in Millions
Jun. 06, 2013
Dec. 31, 2023
Environmental remediation | Phillipsburg, New Jersey    
Commitments and contingencies    
Accrued environmental loss   $ 2.5
Accrued environmental loss, gross   $ 3.8
Environmental remediation | Phillipsburg, New Jersey | Minimum    
Commitments and contingencies    
Accrued environmental loss, discount rate   3.80%
Environmental remediation | Phillipsburg, New Jersey | Maximum    
Commitments and contingencies    
Accrued environmental loss, discount rate   4.80%
Environmental remediation | Gliwice, Poland    
Commitments and contingencies    
Accrued environmental loss   $ 1.1
Mallinckrodt indemnification    
Commitments and contingencies    
Cash held in escrow $ 30.0  
Current percent indemnification 0.80  
Mallinckrodt indemnification | Minimum    
Commitments and contingencies    
Estimate of possible loss, threshold $ 80.0  
Settlement amount awarded $ 12.0  
Mallinckrodt indemnification | First $40 million of environmental costs    
Commitments and contingencies    
Percent indemnified 80.00%  
Mallinckrodt indemnification | First $40 million of environmental costs | Maximum    
Commitments and contingencies    
Estimate of possible loss $ 40.0  
Mallinckrodt indemnification | $40 million to $80 million of environmental costs    
Commitments and contingencies    
Percent indemnified 50.00%  
Mallinckrodt indemnification | $40 million to $80 million of environmental costs | Maximum    
Commitments and contingencies    
Estimate of possible loss $ 40.0  
Mallinckrodt indemnification | $80 million to $110 million of environmental costs    
Commitments and contingencies    
Percent indemnified 100.00%  
Mallinckrodt indemnification | $80 million to $110 million of environmental costs | Maximum    
Commitments and contingencies    
Estimate of possible loss $ 30.0