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Equity Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended				9 Months Ended
	Dec. 31, 2011 Tres Amigas [Member]	May 20, 2011 Tres Amigas [Member]	Jan. 06, 2011 Tres Amigas [Member]	Oct. 09, 2009 Tres Amigas [Member]	Dec. 31, 2011 Blade Dynamics Ltd. [Member]	Aug. 12, 2010 Blade Dynamics Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Acquisition date	October 9, 2009				August 12, 2010
Equity method investment, aggregate cost				$ 1.8
Equity method investment in cash				0.8		8.0
Equity method investment in common stock				1.0
Cash consideration for increase in minority position		$ 1.8	$ 1.8
Equity method investment ownership percentage	34.00%				25.00%

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Month, date and year in which the acquirer obtains control of the acquiree.

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