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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 | 38 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 17, 2023 | Dec. 31, 2023 | Dec. 31, 2023 | Jul. 13, 2023 | Dec. 31, 2022 | Nov. 11, 2022 | Nov. 19, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 400.0 | $ 500.0
Treasury stock acquired, shares |  | 2,400,000 | 31,200,000 |  |  |  |
Treasury stock acquired, average cost per share |  |  | $ 35.21 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 276.0 | $ 276.0 |  |  |  |
Treasury stock, shares |  | 30,765,023 | 30,765,023 |  | 24,590,353 |  |
Treasury stock, carrying value |  | $ 1,000.0 | $ 1,000.0 |  | $ 823.1 |  |
Accelerated Share Repurchase Agreement (ASR) |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 200.0 |  |  |  |  |  |
Treasury stock acquired, shares | 4,800,000 |  |  |  |  |  |
Treasury stock acquired, percentage of shares authorized | 80.00% |  |  |  |  |  |
Treasury stock acquired, average cost per share | $ 33.12 |  |  |  |  |  |
Accelerated share repurchase agreement, settlement payment |  |  |  | $ 14.0 |  |  |

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