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Financial Instruments - Unrealized Gains and Losses (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Fair Value Disclosures [Abstract] |  |
Unrealized gross gains | $ 3.8 | $ 1.6
Unrealized gross losses | 32.2 | 43.2
Fair value of securities in an unrealized gain position | 236.4 | 142.6
Fair value of securities in an unrealized loss position | $ 396.8 | $ 491.2

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