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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The company has evaluated subsequent events through the date the financial statements were issued and has determined that there are no subsequent events that require disclosure except for the following: In October 2012, the company entered into a definitive agreement to acquire the Kansas City Board of Trade. The transaction is subject to regulatory approval and customary closing conditions.