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Other noncurrent liabilities - Other noncurrent liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Other noncurrent liabilities |  |
Accrued development costs | $ 41.4 | $ 42.3
Operating lease liabilities | $ 18.1 | $ 18.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Total | Total
Accrued litigation settlement | $ 16.3 | $ 16.1
Insurance claims and expenses | 15.0 | 14.9
Deferred income | 12.2 | 15.5
Other postretirement benefits | 7.1 | 7.4
Employee benefits | 4.6 | 4.9
Other | 8.0 | 7.8
Total | $ 122.7 | $ 127.5

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