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Commitments and contingencies - Narrative (Details)
$ in Millions
Mar. 31, 2022
USD ($)
disallowance
Loss Contingencies [Line Items]  
Number of disallowances | disallowance 2
Settled Litigation  
Loss Contingencies [Line Items]  
Disallowance $ 7.3
Pending Litigation  
Loss Contingencies [Line Items]  
Disallowance $ 19.9