Acquisitions Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2014
Finite-lived Intangible Assets Acquired	$ 0.5
Forward Insight Commodities Acquisition [Member]
Present Value of Estimated Total Purchase Price	$ 0.5

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration