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Investments in Marketable Securities - Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2022 | Dec. 31, 2021
Marketable Securities [Abstract] |  |
Cost | $ 73.8 | $ 59.1
Unrealized gains | 10.5 | 8.1
Unrealized losses | (10.9) | (2.7)
Fair value | $ 73.4 | $ 64.5

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