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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Long-term debt, gross		$ 234.6	$ 247.6	$ 240.4
Long-term debt		234.1	$ 247.0	239.7
Extinguishment of debt, fair value		9.8
Extinguishment of debt		$ 26.1
Debt instrument interest rate		8.00%
Preferred Stock, Par Value Per Share		$ 1.00	$ 1.00
Gain on early extinguishment of debt		$ 16.7	$ 0.0
Write off of deferred financing cost		$ 0.1
Debt Interest Rate, PIK		5.50%	3.00%
Paid-in-Kind Interest		$ 9.7	$ 5.4
Debt issuance costs		0.5	$ 0.6	$ 0.7
Interest payable		4.7
Interest payable, current		1.5
Interest payable, noncurrent		$ 3.2
Scenario, Forecast [Member]
Extinguishment of debt	$ 204.9
Preferred Stock, Shares Outstanding	104,574
Preferred Stock, Par Value Per Share	$ 1,000
Cash paid in exchange	$ 27.6
Gain on early extinguishment of debt	34.0
Senior Notes [Member] | Scenario, Forecast [Member]
Long-term debt	$ 136.0
Debt instrument interest rate	8.25%
Senior Notes	$ 74.3
Payment in Kind (PIK) Note [Member] | Scenario, Forecast [Member]
Long-term debt	$ 29.6

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