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Investments - Equity Securities and Other-Long Term Investments at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | $ 317.7 | $ 316.5
Valued at Level 3 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 87.0 | 86.6
Hedge funds and private equity funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 188.2 | 186.0
Hedge funds and private equity funds | Valued at NAV |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 185.7 | 182.8
Hedge funds and private equity funds | Valued at Level 3 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 0.0 | 0.0
Strategic investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 101.9 | 105.0
Other investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other long-term investments | 27.6 | 25.5
Strategic investments and Limited liability companies and private equity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Unfunded commitments | $ 32.6 | $ 36.1

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