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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 1,160.8 | $ 132.5
Unrealized losses less than 12 months, gross unrealized losses | (1.4) | (0.1)
Unrealized losses more than 12 months, fair value | 788.6 | 2,595.1
Unrealized losses more than 12 months, gross unrealized losses | (13.2) | (60.4)
Total unrealized losses, fair value | 1,949.4 | 2,727.6
Total unrealized losses, gross unrealized losses | (14.6) | (60.5)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,093.8 | 48.5
Unrealized losses less than 12 months, gross unrealized losses | (1.3) | 0.0
Unrealized losses more than 12 months, fair value | 305.2 | 1,112.9
Unrealized losses more than 12 months, gross unrealized losses | (5.7) | (25.4)
Total unrealized losses, fair value | 1,399.0 | 1,161.4
Total unrealized losses, gross unrealized losses | (7.0) | (25.4)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 35.3 | 54.2
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (0.1)
Unrealized losses more than 12 months, fair value | 324.6 | 1,219.2
Unrealized losses more than 12 months, gross unrealized losses | (5.1) | (25.8)
Total unrealized losses, fair value | 359.9 | 1,273.4
Total unrealized losses, gross unrealized losses | (5.1) | (25.9)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 31.7 | 29.8
Unrealized losses less than 12 months, gross unrealized losses | (0.1) | 0.0
Unrealized losses more than 12 months, fair value | 144.1 | 185.6
Unrealized losses more than 12 months, gross unrealized losses | (2.3) | (7.3)
Total unrealized losses, fair value | 175.8 | 215.4
Total unrealized losses, gross unrealized losses | (2.4) | (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 | 14.7 | 77.4
Unrealized losses more than 12 months, gross unrealized losses | (0.1) | (1.9)
Total unrealized losses, fair value | 14.7 | 77.4
Total unrealized losses, gross unrealized losses | $ (0.1) | $ (1.9)

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