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Environmental Matters - Company's Liability for Environmental Obligations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Environmental Exit Cost [Line Items]
Total Balance at Beginning of Period	$ 7.8	$ 4.6
Additions	0.2	0.3
Less: Payments / Reductions	0.2	0.1
Total Balance at End of Period	7.8	4.8
Less: Current Portion	0.7	0.7	$ 0.7
Noncurrent Balance at End of Period	$ 7.1	$ 4.1	$ 7.1

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- Definition

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

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