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Operations and Summary of Significant Accounting Policies (Cash and Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Accounting Policies [Abstract] |  |  |  |
Cash | $ 342.5 | $ 463.8 | $ 656.7 |
Cash Equivalents | 269.5 | 131.2 | 130.8 |
Restricted cash | 0.7 | 0.5 | 2.0 |
Total | $ 612.7 | $ 595.5 | $ 789.5 | $ 889.1

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