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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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- Definition

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

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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