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v3.25.2

Other noncurrent liabilities - Other noncurrent liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Other noncurrent liabilities |  |
Accrued development costs | $ 24.7 | $ 26.8
Operating lease liabilities | $ 17.1 | $ 17.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Total | Total
Insurance claims and expenses | $ 16.6 | $ 16.6
Asset retirement obligations | 16.2 | 14.3
Deferred income | 8.0 | 11.8
Other postretirement benefits | 7.0 | 6.7
Employee benefits | 5.0 | 4.5
Earn-out liability | 4.6 | 4.3
Other | 0.5 | 0.6
Total | $ 99.7 | $ 102.7

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