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Environmental Matters - Company's Liability for Environmental Obligations (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Environmental Exit Cost [Line Items] |  |  |
Total Balance at Beginning of Period | $ 4.6 | $ 4.4 |
Additions | 0.2 | 0.5 |
Less: Payments / Reductions | 0.1 | 0.2 |
Total Balance at End of Period | 4.7 | 4.7 |
Less: Current Portion | 0.7 | 0.6 | $ 0.6
Noncurrent Balance at End of Period | $ 4.0 | $ 4.1 | $ 4.0

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