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Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 07, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Total number of shares purchased (in millions) |  | 600 | 400 | 600 | 900
Average price per share |  | $ 211.63 | $ 213.30 | $ 211.63 | $ 213.85
Total purchase price (in millions) |  | $ 130.7 | $ 93.9 | $ 130.7 | $ 200.0
Subsequent Event [Member] |  |  |  |  |
Total number of shares purchased (in millions) | 180 |  |  |  |
Average price per share | $ 227.92 |  |  |  |
Total purchase price (in millions) | $ 41.4 |  |  |  |

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