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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2013
Equity [Abstract] |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  |  |  | $ 8,100.0
Number of shares purchased (in shares) |  |  | 723 |  |
Cost of shares repurchased during the period | $ 146.0 | $ 401.0 | $ 146.1 | $ 1,708.0 |
Remaining authorized repurchase amount | $ 1,500.0 |  | $ 1,500.0 |  |

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