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Investments - Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |
Cost | $ 30.0 | $ 35.3
Unrealized gains | 3.7 | 2.6
Unrealized losses | (1.4) | (0.0)
Fair value | $ 32.3 | $ 37.9

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