v3.26.1
Plant Closure Provisions - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Restructuring Cost and Reserve [Line Items]    
Increase to the provisions for legacy operations $ 1.4  
Remediation [Member]    
Restructuring Cost and Reserve [Line Items]    
Accretion expense recognized $ 3.2 $ 4.1