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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 1,323.5 | $ 132.5
Unrealized losses less than 12 months, gross unrealized losses | (7.9) | (0.1)
Unrealized losses more than 12 months, fair value | 1,783.1 | 2,595.1
Unrealized losses more than 12 months, gross unrealized losses | (42.9) | (60.4)
Total unrealized losses, fair value | 3,106.6 | 2,727.6
Total unrealized losses, gross unrealized losses | (50.8) | (60.5)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,214.8 | 48.5
Unrealized losses less than 12 months, gross unrealized losses | (7.5) | 0.0
Unrealized losses more than 12 months, fair value | 705.5 | 1,112.9
Unrealized losses more than 12 months, gross unrealized losses | (18.0) | (25.4)
Total unrealized losses, fair value | 1,920.3 | 1,161.4
Total unrealized losses, gross unrealized losses | (25.5) | (25.4)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 16.0 | 54.2
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (0.1)
Unrealized losses more than 12 months, fair value | 828.8 | 1,219.2
Unrealized losses more than 12 months, gross unrealized losses | (17.6) | (25.8)
Total unrealized losses, fair value | 844.8 | 1,273.4
Total unrealized losses, gross unrealized losses | (17.6) | (25.9)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 92.7 | 29.8
Unrealized losses less than 12 months, gross unrealized losses | (0.4) | 0.0
Unrealized losses more than 12 months, fair value | 179.4 | 185.6
Unrealized losses more than 12 months, gross unrealized losses | (6.1) | (7.3)
Total unrealized losses, fair value | 272.1 | 215.4
Total unrealized losses, gross unrealized losses | (6.5) | (7.3)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 0.0
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | 0.0
Unrealized losses more than 12 months, fair value | 69.4 | 77.4
Unrealized losses more than 12 months, gross unrealized losses | (1.2) | (1.9)
Total unrealized losses, fair value | 69.4 | 77.4
Total unrealized losses, gross unrealized losses | $ (1.2) | $ (1.9)

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