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Property (USD $) In Millions, unless otherwise specified	9 Months Ended
Property (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Significant Acquisitions and Disposals [Line Items]
Proceeds from sale of Board of Trade of the City of Chicago, Inc. building	$ 151.5	$ 0

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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