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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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	$ 166.3			$ 166.3		$ 234.6
Gain on early extinguishment of debt	0.0	33.6	$ 16.7	33.6	$ 16.7
Transaction costs		9.0
Write off of deferred financing cost		0.4
Long-term debt, current	6.4			6.4
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	$ 30.5			$ 30.5		$ 234.6
Interest payable	0.6			0.6
Interest payable, current	0.2			0.2
Interest payable, noncurrent	$ 0.4			$ 0.4
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	$ 135.8			$ 135.8

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