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Investments in Marketable Securities - Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Marketable Securities [Abstract] |  |
Cost | $ 30.6 | $ 35.3
Unrealized gains | 3.6 | 2.6
Unrealized losses | (0.1) | (0.0)
Fair value | $ 34.1 | $ 37.9

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