Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Trade payables	$ 4.9	$ 4.9
Postretirement health and life benefit obligations - current	7.0	11.6
Compensation and benefits payable	23.1	22.2
Provision for Loss on Contracts	0.5	7.0
Operating Lease, Liability, Current	0.9	2.4
Other accrued liabilities	1.4	2.5
Accounts payable and accrued liabilities	$ 37.8	$ 50.6

Compensation and benefits payable

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount of obligations incurred classified as other, payable within one year or the normal operating cycle, if longer.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Amount of liability, recognized in statement of financial position, for pension, other postretirement and postemployment benefits, classified as current.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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