XML 64 R52.htm IDEA: XBRL DOCUMENT v3.23.2
Company's Liability for Environmental Obligations (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Environmental Exit Cost [Line Items]      
Total Balance at Beginning of Period $ 4.4 $ 2.7  
Additions 0.5 0.3  
Less: Payments / Reductions 0.2 0.2  
Total Balance at End of Period 4.7 2.8  
Less: Current Portion 0.6 0.6 $ 0.6
Noncurrent Balance at End of Period $ 4.1 $ 2.2 $ 3.8