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Employee Benefits	6 Months Ended
Employee Benefits	Jun. 30, 2014
Employee Benefits [Abstract]
Postemployment Benefits Disclosure	EMPLOYEE BENEFITS Employees are eligible to participate in the Chicago Board Options Exchange SMART Plan (“SMART Plan”). The SMART Plan is a defined contribution plan, which is qualified under Internal Revenue Code Section 401(k). The Company contributed $2.3 million and $2.1 million to the SMART Plan for the six months ended June 30, 2014 and 2013, respectively. Eligible employees may participate in the Supplemental Employee Retirement Plan, Executive Retirement Plan and Deferred Compensation Plan. Each plan is a defined contribution plan that is non-qualified by Internal Revenue Code regulations. The Company contributed $0.7 million and $0.8 million to the above plans for the six months ended June 30, 2014 and 2013, respectively. The Company has a post-retirement medical plan for former members of senior management. The Company recorded immaterial post-retirement benefits expense for the six months ended June 30, 2014 and 2013.