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Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | $ 26,737.9 |  |
Other comprehensive income/(loss) | (49.9) | $ 77.7 | $ (186.8)
Total CME Group Shareholders' Equity, ending | 26,486.9 | 26,737.9 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (55.6) | (133.3) | 53.5
Other comprehensive income/(loss) | (49.9) | 77.7 | (186.8)
Total CME Group Shareholders' Equity, ending | (105.5) | (55.6) | (133.3)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (55.6) | (133.3) | 53.5
Comprehensive Income Before Reclassification Adjustments | (48.6) | 70.5 | (183.2)
Comprehensive Income Reclassification Adjustments | (1.3) | 6.2 | (0.7)
Income tax benefit (expense) | 0.0 | 1.0 | (2.9)
Other comprehensive income/(loss) | (49.9) | 77.7 | (186.8)
Total CME Group Shareholders' Equity, ending | (105.5) | (55.6) | (133.3)
Foreign Currency Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (93.8) | (174.3) | 21.1
Comprehensive Income Before Reclassification Adjustments | (61.0) | 70.8 | (195.4)
Comprehensive Income Reclassification Adjustments | 2.2 | 9.7 | 0.0
Income tax benefit (expense) | 2.2 | 0.0 | 0.0
Other comprehensive income/(loss) | (56.6) | 80.5 | (195.4)
Total CME Group Shareholders' Equity, ending | (150.4) | (93.8) | (174.3)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | 62.0 | 64.7 | 66.1
Comprehensive Income Before Reclassification Adjustments | 0.0 | 0.0 | 0.0
Comprehensive Income Reclassification Adjustments | (3.6) | (3.6) | (1.9)
Income tax benefit (expense) | 0.9 | 0.9 | 0.5
Other comprehensive income/(loss) | (2.7) | (2.7) | (1.4)
Total CME Group Shareholders' Equity, ending | 59.3 | 62.0 | 64.7
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (23.4) | (22.8) | (34.8)
Comprehensive Income Before Reclassification Adjustments | 12.2 | (0.9) | 14.9
Comprehensive Income Reclassification Adjustments | 0.1 | 0.1 | 1.2
Income tax benefit (expense) | (3.0) | 0.2 | (4.1)
Other comprehensive income/(loss) | 9.3 | (0.6) | 12.0
Total CME Group Shareholders' Equity, ending | (14.1) | (23.4) | (22.8)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Total CME Group Shareholders' Equity, beginning | (0.4) | (0.9) | 1.1
Comprehensive Income Before Reclassification Adjustments | 0.2 | 0.6 | (2.7)
Comprehensive Income Reclassification Adjustments | 0.0 | 0.0 | 0.0
Income tax benefit (expense) | (0.1) | (0.1) | 0.7
Other comprehensive income/(loss) | 0.1 | 0.5 | (2.0)
Total CME Group Shareholders' Equity, ending | $ (0.3) | $ (0.4) | $ (0.9)

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