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Commitments and contingencies - Narrative (Details) $ in Millions | Sep. 30, 2021 USD ($)
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Loss Contingencies [Line Items] |
Performance bond commitments | $ 36.1
Settled Litigation |
Loss Contingencies [Line Items] |
Disallowance | 7.3
Pending Litigation |
Loss Contingencies [Line Items] |
Disallowance | $ 19.9

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