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Income Tax Matters - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax assets: |  |
Loss and credit carryforwards | $ 39.6 | $ 47.7
Defined benefit plans | 3.6 | 2.9
Other assets | 36.8 | 36.3
Lease assets | 8.7 | 10.6
Inventories | 29.5 | 46.9
Excess interest carryforward | 14.0 | 12.2
Research & development capitalization | 16.9 | 8.7
Valuation allowances | (2.7) | (3.7)
Total deferred income tax assets | 146.4 | 161.6
Deferred income tax liabilities: |  |
Property, plant and equipment | (142.6) | (147.0)
Lease liabilities | (8.7) | (9.3)
Undistributed foreign earnings | (3.0) | (2.7)
Total deferred income tax liabilities | (154.3) | (159.0)
Net deferred income tax assets |  | $ 2.6
Net deferred income tax liabilities | $ (7.9) |

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