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Company's Liability for Environmental Obligations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Environmental Exit Cost [Line Items]    
Total Balance at Beginning of Period $ 4.4 $ 2.7
Additions 0.7 2.0
Less: Payments / Reductions 0.5 0.3
Total Balance at end of Period 4.6 4.4
Less: Current Portion 0.6 0.6
Noncurrent Balance at End of Period $ 4.0 $ 3.8