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Debt Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 163.7	$ 234.6
Deferred issuance costs	0.1	0.5
Long-term debt, current and noncurrent	163.6	234.1
Long-term debt, current	6.1	0.0
Long-term debt	157.5	234.1
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	74.3
Long-term debt, interest	58.1
Long-term debt, carrying amount	132.4
Debt Instrument Carrying Amount Current and Noncurrent	132.4
Payment in Kind (PIK) Note [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount Current and Noncurrent	$ 31.3	$ 234.6

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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