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Investments - Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | $ 317.7 | $ 316.5
Equity method eligible unconsolidated entities, using the fair value option |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 66.6 | 66.6
Equity method investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 26.2 | 26.1
Other unconsolidated investments, at fair value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 186.0 | 185.2
Other unconsolidated investments, at cost |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | $ 38.9 | $ 38.6

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