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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Trade payables $ 6.1 $ 5.9
Postretirement health and life benefit obligations - current 10.1 7.3
Compensation and benefits payable 21.1 15.7
Provision for Loss on Contracts 0.0 20.0
Short-term inventory loan 14.3 9.9
Operating Lease, Liability, Current 1.4 3.3
Other accrued liabilities 3.2 3.4
Accounts payable and accrued liabilities $ 56.2 $ 65.5