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Per Common Share Information (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Earnings Per Share [Abstract] |  |  |  |  |  |
Dilutive effect of share-based compensation | 5.5 | 5.5 | 5.4 | 5.4 |  |
Stock options that were not included in diluted weighted-average shares | 1.4 | 1.8 | 3.0 | 1.9 |  |
Dividends Payable, Amount Per Share |  |  |  |  | $ 1.38 |
Dividends payable | $ 1,027.3 |  | $ 1,027.3 |  |  | $ 0.0
Dividends Payable | $ 1,000.0 |  | $ 1,000.0 |  |  |

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