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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Preferred stock, shares issued	104,574	104,574
Preferred stock, liquidation preference per share	$ 1,000
Cash paid in exchange		$ 27.6
Long-term debt, carrying amount	$ 161.5		$ 163.7
Gain on early extinguishment of debt	0.0	33.6
Transaction costs		9.0
Write off of deferred financing cost		0.4
Long-term debt, current	$ 6.1		6.1
Payment in Kind (PIK) Note [Member]
Repurchase of debt		$ 204.9
Debt instrument interest rate	8.00%
Senior Notes [Member]
Debt instrument interest rate	8.25%
Long-term debt, face amount	$ 74.3		74.3
Long-term debt, carrying amount	$ 129.4		$ 132.4

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