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Net Income Per Share (Schedule of Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Per Share Calculation [Line Items]
Net loss	$ (8.2)	$ (41.3)	$ (2.9)	$ (14.6)	$ (101.8)	$ (55.1)	$ (15.1)	$ (15.4)	$ (67.0)	$ (187.4)
Interest expense on convertible notes	$ 4.9	$ 4.7	$ 5.1	$ 5.0	$ 5.0	$ 4.8	$ 4.9	$ 4.9	$ 19.7	$ 19.6
Weighted average common shares									9.1	9.0
Denominator for basic calculation									9.1	9.0
Weighted Average Number of Shares Outstanding, Basic and Diluted									9.1	9.0
Net loss per share - basic and diluted	$ (0.90)	$ (4.54)	$ (0.32)	$ (1.60)	$ (11.19)	$ (6.05)	$ (1.68)	$ (1.71)	$ (7.36)	$ (20.82)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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