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Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Trade payables | $ 3.9 | $ 6.3
Compensation and benefits payable | 21.0 | 17.4
Postretirement health and life benefit obligations - current | 15.4 | 14.7
Accrued severance payments | 4.1 | 3.9
Accrued lease turnover - current | 1.6 | 1.8
Accrued interest payable on debt | 0.6 | 0.2
Other accrued liabilities | 5.8 | 3.9
Accounts payable and accrued liabilities | $ 52.4 | $ 48.2

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