XML 70 R60.htm IDEA: XBRL DOCUMENT v3.25.3
Other noncurrent liabilities - Other noncurrent liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Other noncurrent liabilities    
Accrued development costs $ 24.3 $ 26.8
Asset retirement obligations 16.7 14.3
Insurance claims and expenses 16.6 16.6
Operating lease liabilities $ 16.5 $ 17.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Total Total
Deferred income $ 8.2 $ 11.8
Other postretirement benefits 6.8 6.7
Employee benefits 4.8 4.5
Earn-out liability   4.3
Other 0.6 0.6
Total $ 94.5 $ 102.7