Rendering

Component: (Network and Table)
Network
2412403 - Disclosure - Employee Benefit Plans (Summary of the change in projected benefit obligation) (Details)
(http://www.cmegroup.com/role/EmployeeBenefitPlansSummaryOfChangeInProjectedBenefitObligationDetails)
TableStatement [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001156375 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Pension Plans [Member]
Statement [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
 
 
 
Balance at January 1
217,300,000  
223,700,000  
 
Service cost
16,700,000  
18,400,000  
17,100,000  
Interest cost
10,300,000  
9,800,000  
9,600,000  
Actuarial (gain) loss
5,300,000  
(11,600,000) 
 
Benefits paid
(9,700,000) 
(23,000,000) 
(8,800,000) 
Balance at December 31
239,900,000  
 
217,300,000  
 
223,700,000