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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 1,806.3 | $ 2,922.5
Unrealized losses less than 12 months, gross unrealized losses | (7.5) | (24.5)
Unrealized losses more than 12 months, fair value | 289.6 | 520.1
Unrealized losses more than 12 months, gross unrealized losses | (6.0) | (9.2)
Total unrealized losses, fair value | 2,095.9 | 3,442.6
Total unrealized losses, gross unrealized losses | (13.5) | (33.7)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,731.9 | 2,744.4
Unrealized losses less than 12 months, gross unrealized losses | (7.2) | (23.3)
Unrealized losses more than 12 months, fair value | 118.5 | 190.1
Unrealized losses more than 12 months, gross unrealized losses | (2.9) | (4.2)
Total unrealized losses, fair value | 1,850.4 | 2,934.5
Total unrealized losses, gross unrealized losses | (10.1) | (27.5)
Corporate debt 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 | 122.6 | 218.7
Unrealized losses more than 12 months, gross unrealized losses | (2.5) | (3.7)
Total unrealized losses, fair value | 122.6 | 218.7
Total unrealized losses, gross unrealized losses | (2.5) | (3.7)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 74.4 | 178.1
Unrealized losses less than 12 months, gross unrealized losses | (0.3) | (1.2)
Unrealized losses more than 12 months, fair value | 47.1 | 106.7
Unrealized losses more than 12 months, gross unrealized losses | (0.6) | (1.2)
Total unrealized losses, fair value | 121.5 | 284.8
Total unrealized losses, gross unrealized losses | (0.9) | (2.4)
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 | 1.4 | 4.6
Unrealized losses more than 12 months, gross unrealized losses | 0.0 | (0.1)
Total unrealized losses, fair value | 1.4 | 4.6
Total unrealized losses, gross unrealized losses | $ 0.0 | $ (0.1)

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