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Earnings Per Share (Details 2) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average anti-dilutive shares have been excluded from the EPS calculations	3.2	3.6
Unvested Shares
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average anti-dilutive shares have been excluded from the EPS calculations	0	0

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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