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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Trade payables $ 5.9 $ 4.9
Postretirement health and life benefit obligations - current 7.3 7.0
Compensation and benefits payable 15.7 23.1
Provision for Loss on Contracts 20.0 0.5
Short-term inventory loan 9.9 0.0
Operating Lease, Liability, Current 3.3 0.9
Other accrued liabilities 3.4 1.4
Accounts payable and accrued liabilities $ 65.5 $ 37.8