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Commitments and contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Mallinckrodt indemnification  
Commitments and contingencies  
Cash held in escrow $ 30.0
Mallinckrodt indemnification | Minimum  
Commitments and contingencies  
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
Environmental remediation | Phillipsburg, New Jersey  
Commitments and contingencies  
Accrued environmental loss 3.8
Accrued environmental loss, gross $ 4.3
Environmental remediation | Phillipsburg, New Jersey | Minimum  
Commitments and contingencies  
Accrued environmental loss, discount rate 0.10%
Environmental remediation | Phillipsburg, New Jersey | Maximum  
Commitments and contingencies  
Accrued environmental loss, discount rate 1.60%
Environmental remediation | Gliwice, Poland  
Commitments and contingencies  
Accrued environmental loss $ 3.4