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Environmental Matters - Company's Liability for Environmental Obligations (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Environmental Exit Cost [Line Items]
Total Balance at Beginning of Period	$ 7.8	$ 4.7
Additions	1.5	0.4
Less: Payments / Reductions	0.5	0.3
Total Balance at End of Period	8.8	4.8
Less: Current Portion	0.8	0.8	$ 0.7
Noncurrent Balance at End of Period	$ 8.0	$ 4.0	$ 7.1

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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