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Other noncurrent liabilities - Other noncurrent liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Other noncurrent liabilities    
Accrued development costs $ 35.7 $ 42.3
Operating lease liabilities $ 18.1 $ 18.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Total Total
Insurance claims and expenses $ 15.0 $ 14.9
Asset retirement obligations 14.5 7.2
Deferred income 12.3 15.5
Other postretirement benefits 7.2 7.4
Employee benefits 4.7 4.9
Earn-out liability 4.2  
Accrued litigation settlement   16.1
Other 0.6 0.6
Total $ 112.3 $ 127.5