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Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2024
Shareholders' Equity [Abstract] |  |
Total number of shares purchased (in millions) | 0.4 | 0.9
Average price per share | $ 213.30 | $ 213.85
Total purchase price (in millions) | $ 93.9 | $ 200.0

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