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Environmental Matters - Company's Liability for Environmental Obligations (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Environmental Exit Cost [Line Items] |  |  |
Total Balance at Beginning of Period | $ 7.8 | $ 4.6 |
Additions | 0.3 | 0.2 |
Less: Payments / Reductions | 0.3 | 0.1 |
Total Balance at End of Period | 7.8 | 4.7 |
Less: Current Portion | 0.7 | 0.7 | $ 0.7
Noncurrent Balance at End of Period | $ 7.1 | $ 4.0 | $ 7.1

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