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Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions | Total | Common Stock And Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Parent [Member] | Noncontrolling Interest [Member] | Class A Common Stock [Member] | Class A Common Stock [Member] Common Stock And Additional Paid-In Capital [Member] | Class B Common Stock [Member] | Class B Common Stock [Member] Common Stock And Additional Paid-In Capital [Member] | Preferred Stock [Member] Common Stock And Additional Paid-In Capital [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  | 358,110 |  | 3 |
Balance at Dec. 31, 2020 | $ 26,351.5 | $ 21,189.1 | $ 4,995.9 | $ 134.9 | $ 26,319.9 |  |  |  |  |  |
Balance at Dec. 31, 2020 |  |  |  |  |  | $ 31.6 |  |  |  |  |
Less: net (income) loss attributable to non-controlling interests | (0.5) |  |  |  |  | (0.5) |  |  |  |  |
Net Income Attributable to CME Group | 2,011.2 |  | 2,011.2 |  | 2,011.2 |  |  |  |  |  |
Net Income | 2,011.7 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (97.6) |  |  | (97.6) | (97.6) |  |  |  |  |  |
Dividends, Cash | (969.7) |  | (969.7) |  | (969.7) |  |  |  |  |  |
Purchase of noncontrolling interest | (52.0) | (19.9) |  |  | (19.9) | 32.1 |  |  |  |  |
Exercise of stock options, shares |  |  |  |  |  |  |  | 102 |  |  |
Exercise of stock options | 5.5 | 5.5 |  |  | 5.5 |  |  |  |  |  |
Vesting of issued restricted Class A common stock, shares |  |  |  |  |  |  |  | 329 |  |  |
Vesting of issued restricted Class A common stock | (31.2) | (31.2) |  |  | (31.2) |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  |  | 13 |  |  |
Stock Issued During Period, Value, Issued for Services | 2.9 | 2.9 |  |  | 2.9 |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  |  |  |  | 20 |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 4.4 | 4.4 |  |  | 4.4 |  |  |  |  |  |
Stock-based compensation | 56.6 | 56.6 |  |  | 56.6 |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2021 |  |  |  |  |  |  |  | 358,574 |  | 3 |
Balance at Sep. 30, 2021 | 27,282.1 | 21,207.4 | 6,037.4 | 37.3 | 27,282.1 |  |  |  |  |  |
Balance at Sep. 30, 2021 |  |  |  |  |  | 0.0 |  |  |  |  |
Balance (in shares) at Jun. 30, 2021 |  |  |  |  |  |  |  | 358,305 |  | 3 |
Balance at Jun. 30, 2021 | 26,787.4 | 21,222.7 | 5,434.5 | 106.0 | 26,763.2 |  |  |  |  |  |
Balance at Jun. 30, 2021 |  |  |  |  |  | 24.2 |  |  |  |  |
Less: net (income) loss attributable to non-controlling interests | 0.2 |  |  |  |  | 0.2 |  |  |  |  |
Net Income Attributable to CME Group | 926.5 |  | 926.5 |  | 926.5 |  |  |  |  |  |
Net Income | 926.3 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (68.7) |  |  | (68.7) | (68.7) |  |  |  |  |  |
Dividends, Cash | (323.6) |  | (323.6) |  | (323.6) |  |  |  |  |  |
Purchase of noncontrolling interest | (39.5) | (15.5) |  |  | (15.5) | 24.0 |  |  |  |  |
Exercise of stock options, shares |  |  |  |  |  |  |  | 43 |  |  |
Exercise of stock options | 2.3 | 2.3 |  |  | 2.3 |  |  |  |  |  |
Vesting of issued restricted Class A common stock, shares |  |  |  |  |  |  |  | 226 |  |  |
Vesting of issued restricted Class A common stock | (17.7) | (17.7) |  |  | (17.7) |  |  |  |  |  |
Stock-based compensation | 15.6 | 15.6 |  |  | 15.6 |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2021 |  |  |  |  |  |  |  | 358,574 |  | 3 |
Balance at Sep. 30, 2021 | 27,282.1 | 21,207.4 | 6,037.4 | 37.3 | 27,282.1 |  |  |  |  |  |
Balance at Sep. 30, 2021 |  |  |  |  |  | $ 0.0 |  |  |  |  |
Balance (in shares) at Dec. 31, 2021 |  |  |  |  |  |  | 358,599 | 358,599 | 3 | 3 | 4,584
Balance at Dec. 31, 2021 | 27,399.3 | 22,193.9 | 5,151.9 | 53.5 | 27,399.3 |  |  |  |  |  |
Less: net (income) loss attributable to non-controlling interests | 0.0 |  |  |  |  |  |  |  |  |  |
Net Income Attributable to CME Group | 2,053.1 |  | 2,053.1 |  | 2,053.1 |  |  |  |  |  |
Net Income | 2,053.1 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (153.3) |  |  | (153.3) | (153.3) |  |  |  |  |  |
Dividends, Cash |  |  | (1,093.3) |  | (1,093.3) |  |  |  |  |  |
Exercise of stock options, shares |  |  |  |  |  |  |  | 1 |  |  |
Exercise of stock options |  | 0.1 |  |  | 0.1 |  |  |  |  |  |
Vesting of issued restricted Class A common stock, shares |  |  |  |  |  |  |  | 239 |  |  |
Vesting of issued restricted Class A common stock |  | (21.7) |  |  | (21.7) |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  |  | 19 |  |  |
Stock Issued During Period, Value, Issued for Services |  | 4.0 |  |  | 4.0 |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  |  |  |  | 19 |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  | 3.8 |  |  | 3.8 |  |  |  |  |  |
Stock-based compensation |  | 58.8 |  |  | 58.8 |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2022 |  |  |  |  |  |  | 358,877 | 358,877 | 3 | 3 | 4,584
Balance at Sep. 30, 2022 | 28,250.8 | 22,238.9 | 6,111.7 | (99.8) | 28,250.8 |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  |  |  |  |  |  | 358,677 |  | 3 | 4,584
Balance at Jun. 30, 2022 |  | 22,235.9 | 5,797.5 | (31.7) | 28,001.7 |  |  |  |  |  |
Less: net (income) loss attributable to non-controlling interests | 0.0 |  |  |  |  |  |  |  |  |  |
Net Income Attributable to CME Group | 679.6 |  | 679.6 |  | 679.6 |  |  |  |  |  |
Net Income | 679.6 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (68.1) |  |  | (68.1) | (68.1) |  |  |  |  |  |
Dividends, Cash |  |  | (365.4) |  | (365.4) |  |  |  |  |  |
Vesting of issued restricted Class A common stock, shares |  |  |  |  |  |  |  | 200 |  |  |
Vesting of issued restricted Class A common stock |  | (16.4) |  |  | (16.4) |  |  |  |  |  |
Stock-based compensation |  | 19.4 |  |  | 19.4 |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2022 |  |  |  |  |  |  | 358,877 | 358,877 | 3 | 3 | 4,584
Balance at Sep. 30, 2022 | $ 28,250.8 | $ 22,238.9 | $ 6,111.7 | $ (99.8) | $ 28,250.8 |  |  |  |  |  |

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