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Schedule II—Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2022
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, 2022, 2021 and 2020
(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, 2022
Allowance for doubtful accounts$5.6 $3.9 $(1.4)$8.1 
Allowance for deferred tax assets0.6 — (0.2)0.4 
Year Ended December 31, 2021
Allowance for doubtful accounts$5.4 $1.9 $(1.7)$5.6 
Allowance for deferred tax assets11.3 — (10.7)0.6 
Year Ended December 31, 2020
Allowance for doubtful accounts$3.4 $1.7 $0.3 $5.4 
Allowance for deferred tax assets10.0 1.3 — 11.3 
_______________
(1)Includes write-offs of doubtful accounts, foreign currency and write-offs of fully reserved deferred tax assets. Other activity for the allowance for doubtful accounts also includes the impact of the adoption of new guidance on credit losses in 2020.
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.