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Investments in Marketable Securities - Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Marketable Securities [Abstract] |  |
Cost | $ 80.1 | $ 394.4
Unrealized gains | 17.0 | 59.9
Unrealized losses | (1.3) | (6.4)
Fair value | $ 95.8 | $ 447.9

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