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Company's Liability for Environmental Obligations (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Environmental Exit Cost [Line Items]
Total Balance at Beginning of Period	$ 2.1	$ 2.7
Additions	0.6	0.1
Less: Payments / Reductions	0.3	0.6
Total Balance at End of Period	2.4	2.2
Less: Current Portion	0.7	0.3	$ 0.3
Noncurrent Balance at End of Period	$ 1.7	$ 1.9	$ 1.8

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

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