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Commitments and contingencies - Changes in Accrued Environmental Remediation and Related Costs (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Environmental Remediation Obligations |  |
Balance at the beginning of the period | $ 74.6 |
Additions charged to expense, net | 2.2 |
Payments, net | (58.2) |
Balance at the end of the period | 18.6 |
Amounts recognized in the Consolidated Balance Sheet at the end of the period: |  |
Current liabilities | 4.3 | $ 59.7
Noncurrent liabilities | 14.3 | 14.9
Total | $ 18.6 | $ 74.6

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