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Net Income (Loss) per Common Share (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restricted Stock [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Weighted average number of awards outstanding for computation of diluted earnings per share (in shares)	0	0	0	0
Weighted average number of awards outstanding excluded from the computation of diluted earnings per share (in shares)	0	0	0	0.1
Stock Option [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Weighted average number of awards outstanding for computation of diluted earnings per share (in shares)	0	0	0	0
Weighted average number of awards outstanding excluded from the computation of diluted earnings per share (in shares)	0.8	1.1	0.3	1.2

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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