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Company's Liability for Environmental Obligations (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Environmental Exit Cost [Line Items]      
Total Balance at Beginning of Period $ 2.7 $ 2.1  
Additions 0.3 0.1  
Less: Payments / Reductions 0.2 0.1  
Total Balance at End of Period 2.8 2.1  
Less: Current Portion 0.6 0.4 $ 0.5
Noncurrent Balance at End of Period $ 2.2 $ 1.7 $ 2.2