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Income taxes - Components of Net Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Income taxes |  |
Inventories | $ 1.1 |
Lease assets (liabilities) | 5.7 | $ 5.3
Accrued OPEB costs | 1.8 | 1.7
Accrued pension costs | 26.8 | 21.6
Other accrued liabilities and deductible differences | 16.9 | 15.3
Tax loss and tax credit carryforwards | 107.7 | 70.7
Valuation allowance | (6.4) | (3.8)
Adjusted gross deferred tax assets (liabilities) | 153.6 | 110.8
Netting by tax jurisdiction | (70.3) | (58.8)
Net noncurrent deferred tax asset (liability) | 83.3 | 52.0
Inventories, Liabilities |  | (5.5)
Property and equipment, Liabilities | (59.3) | (59.1)
Lease, Liabilities | (5.7) | (5.4)
Other taxable differences | (3.5) | (3.9)
Tax on unremitted earnings of non-U.S. subsidiaries | (10.8) | (11.3)
Adjusted gross deferred tax, Liabilities | (79.3) | (85.2)
Netting by tax jurisdiction, Liabilities | 70.3 | 58.8
Net noncurrent deferred tax, Liability | $ (9.0) | $ (26.4)

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