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Earnings Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 17 Months Ended | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2022 | Apr. 30, 2022 | Dec. 31, 2021 | Nov. 19, 2021 | Oct. 18, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  | $ 500.0 | $ 500.0
Treasury stock acquired, shares | 4,500,000 | 13,600,000 |  |  |  |
Treasury stock acquired, average price per common share |  | $ 32.73 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 556.0 | $ 556.0 |  |  |  |
Treasury stock, shares | 14,326,518 | 14,326,518 |  | 9,936,715 |  |
Treasury stock, carrying value | $ 438.6 | $ 438.6 |  | $ 260.6 |  |
Subsequent Events |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired, shares |  |  | 15,300,000 |  |  |
Treasury stock acquired, average price per common share |  |  | $ 33.43 |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 489.0 |  |  |

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