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Commitment and contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Individual claim stop-loss deductible amount | $ 1.0 |  | $ 1.0 |  |
Workers' compensation liability | 47.0 |  | 47.0 |  | $ 40.0
Receivables from insurers | 12.0 |  | 12.0 |  | 11.0
Medical self-insurance liabilities | 16.0 |  | 16.0 |  | $ 15.0
Tangible asset impairment charges | 29.0 | $ 1.0 | 29.0 | $ 2.0 |
Kennewick, Washington Warehouse Fire |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Insurance recoveries | 32.0 |  | 32.0 |  |
Tangible asset impairment charges | 24.0 |  | 24.0 |  |
Clean up costs | 9.0 |  | 9.0 |  |
Insurance deductibles | 1.0 |  | 1.0 |  |
Net loss | 1.0 |  | 1.0 |  |
Loss contingency, receivable | $ 32.0 |  | $ 32.0 |  |

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