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Earnings Per Share (Net Income Attributable To CME Group) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Dividends, Preferred Stock	$ (5.0)	$ (4.6)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(6.1)	(4.4)
Net Income Attributable to Common Shareholders of CME Group	$ 872.7	$ 702.0
Basic (in shares)	358,933	358,609
Effect of stock options, restricted stock and performance shares	380	571
Diluted (in shares)	359,313	359,180
Earnings per common share, basic (in dollars per share)	$ 2.43	$ 1.96
Earnings per common share, diluted (in dollars per share)	$ 2.43	$ 1.95

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