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Company's Liability for Environmental Obligations (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Environmental Exit Cost [Line Items]      
Total Balance at Beginning of Period $ 4.4 $ 2.7  
Additions 0.5 0.0  
Less: Payments / Reductions (0.2) 0.0  
Total Balance at End of Period 4.7 2.7  
Less: Current Portion 0.6 0.5 $ 0.6
Noncurrent Balance at End of Period $ 4.1 $ 2.2 $ 3.8