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Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning $ 26,319.9    
Other comprehensive income/(loss) (81.4) $ 131.5 $ (1.9)
Total CME Group Shareholders' Equity, ending 27,399.3 26,319.9  
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning 134.9 3.4 5.3
Other comprehensive income/(loss) (81.4) 131.5 (1.9)
Total CME Group Shareholders' Equity, ending 53.5 134.9 3.4
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning 134.9 3.4 5.3
Comprehensive Income Before Reclassification Adjustments (37.5) 128.0 (5.6)
Comprehensive Income Reclassification Adjustments (36.8) 2.4 3.7
Income tax benefit (expense) (7.1) 1.1 0.0
Other comprehensive income/(loss) (81.4) 131.5 (1.9)
Total CME Group Shareholders' Equity, ending 53.5 134.9 3.4
Foreign Currency Gain (Loss) [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning 123.4 (11.3) (10.7)
Comprehensive Income Before Reclassification Adjustments (62.0) 134.3 (0.6)
Comprehensive Income Reclassification Adjustments (40.3) 0.4 0.0
Income tax benefit (expense) 0.0 0.0 0.0
Other comprehensive income/(loss) (102.3) 134.7 (0.6)
Total CME Group Shareholders' Equity, ending 21.1 123.4 (11.3)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning 67.0 69.0 69.7
Comprehensive Income Before Reclassification Adjustments 0.0 0.0 0.6
Comprehensive Income Reclassification Adjustments (1.2) (2.7) (1.2)
Income tax benefit (expense) 0.3 0.7 (0.1)
Other comprehensive income/(loss) (0.9) (2.0) (0.7)
Total CME Group Shareholders' Equity, ending 66.1 67.0 69.0
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning (57.1) (55.1) (53.8)
Comprehensive Income Before Reclassification Adjustments 25.5 (7.4) (6.6)
Comprehensive Income Reclassification Adjustments 4.4 4.7 4.9
Income tax benefit (expense) (7.6) 0.7 0.4
Other comprehensive income/(loss) 22.3 (2.0) (1.3)
Total CME Group Shareholders' Equity, ending (34.8) (57.1) (55.1)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income [Roll Forward]      
Total CME Group Shareholders' Equity, beginning 1.6 0.8 0.1
Comprehensive Income Before Reclassification Adjustments (1.0) 1.1 1.0
Comprehensive Income Reclassification Adjustments 0.3 0.0 0.0
Income tax benefit (expense) 0.2 (0.3) (0.3)
Other comprehensive income/(loss) (0.5) 0.8 0.7
Total CME Group Shareholders' Equity, ending $ 1.1 $ 1.6 $ 0.8