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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Preferred stock, shares issued	104,574			104,574
Preferred stock, liquidation preference per share	$ 1,000			$ 1,000
Cash paid in exchange		$ 27.6
Long-term debt, carrying amount	$ 163.7			$ 163.7		$ 234.6
Gain on early extinguishment of debt	0.0	33.6	$ 0.0	33.6	$ 16.7
Transaction costs		9.0
Write off of deferred financing cost		0.4
Long-term debt, current	6.1			6.1
Subordination to credit facility, facility total	50.0			50.0
Subordination to credit facility, facility maximum net borrowing	$ 40.0			$ 40.0
Payment in Kind (PIK) Note [Member]
Repurchase of debt		$ 204.9
Debt instrument interest rate	8.00%			8.00%
Long-term debt, carrying amount						$ 234.6
Senior Notes [Member]
Debt instrument interest rate	8.25%			8.25%
Long-term debt, face amount	$ 74.3			$ 74.3
Long-term debt, carrying amount	$ 132.4			$ 132.4

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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 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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