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Environmental Matters - Company's Liability for Environmental Obligations (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Environmental Exit Cost [Line Items]      
Total Balance at Beginning of Period $ 4.7 $ 4.4  
Additions 0.4 0.7  
Less: Payments / Reductions 0.3 0.5  
Total Balance at End of Period 4.8 4.6  
Less: Current Portion 0.8 0.6 $ 0.6
Noncurrent Balance at End of Period $ 4.0 $ 4.0 $ 4.0