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v3.25.1

Marketable Securities - Schedule of Fair Value and Unrealized Losses of Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 11,826.9 | $ 12,179.8
12 Months or Greater | 665.8 | 1,219.5
Total | 12,492.7 | 13,399.3
Unrealized Losses |  |
Less than 12 Months | (6.3) | (21.0)
12 Months or Greater | (11.4) | (18.0)
Total | (17.7) | (39.0)
Corporate bonds |  |
Fair Value |  |
Less than 12 Months | 7,982.1 | 7,175.8
12 Months or Greater | 593.5 | 1,044.8
Total | 8,575.6 | 8,220.6
Unrealized Losses |  |
Less than 12 Months | (4.1) | (14.2)
12 Months or Greater | (11.0) | (17.2)
Total | (15.1) | (31.4)
U.S. government and government agency obligations |  |
Fair Value |  |
Less than 12 Months | 3,473.9 | 4,675.3
12 Months or Greater | 61.3 | 141.7
Total | 3,535.2 | 4,817.0
Unrealized Losses |  |
Less than 12 Months | (1.9) | (6.2)
12 Months or Greater | (0.4) | (0.7)
Total | (2.3) | (6.9)
Sovereign bonds |  |
Fair Value |  |
Less than 12 Months | 60.2 | 63.3
12 Months or Greater | 0.0 | 19.1
Total | 60.2 | 82.4
Unrealized Losses |  |
Less than 12 Months | (0.1) | (0.3)
12 Months or Greater | 0.0 | (0.1)
Total | (0.1) | (0.4)
Asset-backed securities |  |
Fair Value |  |
Less than 12 Months | 310.7 | 265.4
12 Months or Greater | 11.0 | 13.9
Total | 321.7 | 279.3
Unrealized Losses |  |
Less than 12 Months | (0.2) | (0.3)
12 Months or Greater | 0.0 | 0.0
Total | $ (0.2) | $ (0.3)

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