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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 2,922.5 | $ 132.5
Unrealized losses less than 12 months | (24.5) | (0.1)
Unrealized losses 12 months or greater, fair value | 520.1 | 2,595.1
Unrealized losses 12 months or greater | (9.2) | (60.4)
Total Fair Value | 3,442.6 | 2,727.6
Total Unrealized Losses | (33.7) | (60.5)
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 2,744.4 | 48.5
Unrealized losses less than 12 months | (23.3) | 0.0
Unrealized losses 12 months or greater, fair value | 190.1 | 1,112.9
Unrealized losses 12 months or greater | (4.2) | (25.4)
Total Fair Value | 2,934.5 | 1,161.4
Total Unrealized Losses | (27.5) | (25.4)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 54.2
Unrealized losses less than 12 months | 0.0 | (0.1)
Unrealized losses 12 months or greater, fair value | 218.7 | 1,219.2
Unrealized losses 12 months or greater | (3.7) | (25.8)
Total Fair Value | 218.7 | 1,273.4
Total Unrealized Losses | (3.7) | (25.9)
U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 178.1 | 29.8
Unrealized losses less than 12 months | (1.2) | 0.0
Unrealized losses 12 months or greater, fair value | 106.7 | 185.6
Unrealized losses 12 months or greater | (1.2) | (7.3)
Total Fair Value | 284.8 | 215.4
Total Unrealized Losses | (2.4) | (7.3)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 0.0
Unrealized losses less than 12 months | 0.0 | 0.0
Unrealized losses 12 months or greater, fair value | 4.6 | 77.4
Unrealized losses 12 months or greater | (0.1) | (1.9)
Total Fair Value | 4.6 | 77.4
Total Unrealized Losses | $ (0.1) | $ (1.9)

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