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Company's Liability for Environmental Obligations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Environmental Exit Cost [Line Items]
Total Balance at Beginning of Period	$ 2.7	$ 2.1
Additions	0.0	0.1
Less: Payments / Reductions	0.0	0.1
Total Balance at End of Period	2.7	2.1
Less: Current Portion	0.5	0.3	$ 0.5
Noncurrent Balance at End of Period	$ 2.2	$ 1.8	$ 2.2

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

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