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Debt Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 161.5	$ 163.7
Deferred issuance costs	0.1	0.1
Long-term debt, current and noncurrent	161.4	163.6
Long-term debt, current	6.1	6.1
Long-term debt	155.3	157.5
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	74.3	74.3
Long-term debt, interest	55.1	58.1
Long-term debt, carrying amount	129.4	132.4
Payment in Kind (PIK) Note [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount Current and Noncurrent	$ 32.1	$ 31.3

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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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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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