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Earnings Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 26 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Nov. 11, 2022 | Dec. 31, 2021 | Nov. 19, 2021 | Oct. 18, 2020
Earnings Per Share [Abstract] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 400.0 |  | $ 500.0 | $ 500.0
Treasury stock acquired, shares | 14,800,000 | 23,900,000 |  |  |  |
Treasury stock acquired, average cost per share |  | $ 34.74 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 569.0 | $ 569.0 |  |  |  |
Treasury stock, shares | 24,590,353 | 24,590,353 |  | 9,936,715 |  |
Treasury stock, carrying value | $ 823.1 | $ 823.1 |  | $ 260.6 |  |

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