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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Trade payables $ 11.5 $ 5.4
Compensation and benefits payable 12.5 19.2
Postretirement health and life benefit obligations - current 13.8 5.3
Accrued severance payments 3.4 8.7
Other accrued liabilities 5.2 6.2
Accounts payable and accrued liabilities $ 46.4 $ 44.8