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Earnings (Loss) Per Share (Details 1) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2012
Stock appreciation rights were outstanding, but not included in the diluted loss per share calculation
Weighted-average number of shares	0.1	1.1
Price ranges per share, minimum	$ 51.40	$ 34.06
Price ranges per share, maximum	$ 51.40	$ 46.78

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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