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Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | $ 26,878.7 |  |
Other comprehensive income/(loss) | 77.7 | $ (186.8) | $ (81.4)
Total CME Group Shareholders' Equity, ending | 26,737.9 | 26,878.7 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (133.3) | 53.5 | 134.9
Other comprehensive income/(loss) | 77.7 | (186.8) | (81.4)
Total CME Group Shareholders' Equity, ending | (55.6) | (133.3) | 53.5
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (133.3) | 53.5 | 134.9
Comprehensive Income Before Reclassification Adjustments | 70.5 | (183.2) | (37.5)
Comprehensive Income Reclassification Adjustments | (3.5) | (0.7) | (36.8)
Income tax benefit (expense) | 1.0 | (2.9) | (7.1)
Other comprehensive income/(loss) | 77.7 | (186.8) | (81.4)
Total CME Group Shareholders' Equity, ending | (55.6) | (133.3) | 53.5
Foreign Currency Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (174.3) | 21.1 | 123.4
Comprehensive Income Before Reclassification Adjustments | 70.8 | (195.4) | (62.0)
Comprehensive Income Reclassification Adjustments | 0.0 | 0.0 | (40.3)
Income tax benefit (expense) | 0.0 | 0.0 | 0.0
Other comprehensive income/(loss) | 80.5 | (195.4) | (102.3)
Total CME Group Shareholders' Equity, ending | (93.8) | (174.3) | 21.1
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | 64.7 | 66.1 | 67.0
Comprehensive Income Before Reclassification Adjustments | 0.0 | 0.0 | 0.0
Comprehensive Income Reclassification Adjustments | (3.6) | (1.9) | (1.2)
Income tax benefit (expense) | 0.9 | 0.5 | 0.3
Other comprehensive income/(loss) | (2.7) | (1.4) | (0.9)
Total CME Group Shareholders' Equity, ending | 62.0 | 64.7 | 66.1
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (22.8) | (34.8) | (57.1)
Comprehensive Income Before Reclassification Adjustments | (0.9) | 14.9 | 25.5
Comprehensive Income Reclassification Adjustments | 0.1 | 1.2 | 4.4
Income tax benefit (expense) | 0.2 | (4.1) | (7.6)
Other comprehensive income/(loss) | (0.6) | 12.0 | 22.3
Total CME Group Shareholders' Equity, ending | (23.4) | (22.8) | (34.8)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (0.9) | 1.1 | 1.6
Comprehensive Income Before Reclassification Adjustments | 0.6 | (2.7) | (1.0)
Comprehensive Income Reclassification Adjustments | 0.0 | 0.0 | 0.3
Income tax benefit (expense) | (0.1) | 0.7 | 0.2
Other comprehensive income/(loss) | 0.5 | (2.0) | (0.5)
Total CME Group Shareholders' Equity, ending | $ (0.4) | $ (0.9) | $ 1.1

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