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Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Trade payables	$ 6.3	$ 11.5
Compensation and benefits payable	17.4	12.5
Postretirement health and life benefit obligations - current	14.7	13.8
Accrued severance payments	3.9	3.4
Current portion of interest on 8.25% Notes	6.1	0.0
Accrued interest on PIK Toggle Notes (cash portion)	0.2	1.5
Other accrued liabilities	4.7	3.7
Accounts payable and accrued liabilities	$ 53.3	$ 46.4

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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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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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