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Schedule II—Valuation and Qualifying Accounts | 12 Months Ended
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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 assets | 0.4 |  |  |  |  | (0.4) |  |  | — |  |  | — |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 8.1 |  |  |  |  | $ | 0.6 |  |  | $ | (1.6) |  |  | $ | 7.1 |
Allowance for deferred tax assets | 0.4 |  |  |  |  | — |  |  | — |  |  | 0.4 |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 5.6 |  |  |  |  | $ | 3.9 |  |  | $ | (1.4) |  |  | $ | 8.1 |
Allowance for deferred tax assets | 0.6 |  |  |  |  | — |  |  | (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.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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- References No definition available. + Details
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