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Schedule II—Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
CME Group Inc. and Subsidiaries
Schedule II—Valuation and Qualifying Accounts
For the Years Ended December 31, 2024, 2023 and 2022
(dollars in millions) 
Balance at
beginning
of year		Charged
(credited) to
costs and
expenses
Other(1)
Balance
at end
of year
Year Ended December 31, 2024
Allowance for doubtful accounts$7.1 $2.1 $(0.2)$9.0 
Allowance for deferred tax assets0.4 (0.4)— — 
Year Ended December 31, 2023
Allowance for doubtful accounts$8.1 $0.6 $(1.6)$7.1 
Allowance for deferred tax assets0.4 — — 0.4 
Year Ended December 31, 2022
Allowance for doubtful accounts$5.6 $3.9 $(1.4)$8.1 
Allowance for deferred tax assets0.6 — (0.2)0.4 
_______________
(1)Includes write-offs of doubtful accounts, foreign currency and write-offs of fully reserved deferred tax assets.
All other schedules have been omitted because the information required to be set forth in those schedules is not applicable or is shown on the consolidated financial statements or notes thereto.