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Investments - Available-for-Sale Debt Securities in Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 942.2 | $ 234.6
12 months or longer | 0.0 | 3.5
Total | 942.2 | 238.1
Gross Unrealized Losses |  |
Less than 12 months | (4.1) | (0.3)
12 months or longer | 0.0 | 0.0
Total | (4.1) | (0.3)
U.S. government and agency securities |  |
Fair Value |  |
Less than 12 months | 822.6 | 215.0
12 months or longer | 0.0 | 3.5
Total | 822.6 | 218.5
Gross Unrealized Losses |  |
Less than 12 months | (3.3) | (0.3)
12 months or longer | 0.0 | 0.0
Total | (3.3) | (0.3)
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 119.6 | 19.6
12 months or longer | 0.0 | 0.0
Total | 119.6 | 19.6
Gross Unrealized Losses |  |
Less than 12 months | (0.8) | 0.0
12 months or longer | 0.0 | 0.0
Total | $ (0.8) | $ 0.0

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