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Schedule II—Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2021
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, 2021, 2020 and 2019 (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, 2021 |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 5.4 |  |  |  |  | $ | 1.9 |  |  | $ | (1.7) |  |  | $ | 5.6 |
Allowance for deferred tax assets | 11.3 |  |  |  |  | — |  |  | (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 assets | 10.0 |  |  |  |  | 1.3 |  |  | — |  |  | 11.3 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 2.7 |  |  |  |  | $ | 2.1 |  |  | $ | (1.4) |  |  | $ | 3.4 |
Allowance for deferred tax assets | 10.7 |  |  |  |  | (0.7) |  |  | — |  |  | 10.0 |
_______________ (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.

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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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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