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Commitments and Contingencies Commitments and Contingencies Narrative (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Jul. 31, 2013
Loss Contingencies [Line Items]
Number of US Options Exchanges	2ice_NumberofUSOptionsExchanges
NYSE AMEX OPTION [Member]
Loss Contingencies [Line Items]
Number of External Investors, Significant Equity Interest Sold	7
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		16.00%
Noncontrolling Interest, Ownership Percentage by Parent		84.00%
Redeemable Noncontrolling Interest, Equity, Fair Value	$ 130

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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