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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 1,823.5 | $ 2,922.5
Unrealized losses less than 12 months, gross unrealized losses | (4.4) | (24.5)
Unrealized losses more than 12 months, fair value | 201.1 | 520.1
Unrealized losses more than 12 months, gross unrealized losses | (4.3) | (9.2)
Total unrealized losses, fair value | 2,024.6 | 3,442.6
Total unrealized losses, gross unrealized losses | (8.7) | (33.7)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,779.3 | 2,744.4
Unrealized losses less than 12 months, gross unrealized losses | (4.3) | (23.3)
Unrealized losses more than 12 months, fair value | 101.9 | 190.1
Unrealized losses more than 12 months, gross unrealized losses | (2.0) | (4.2)
Total unrealized losses, fair value | 1,881.2 | 2,934.5
Total unrealized losses, gross unrealized losses | (6.3) | (27.5)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 7.0 | 0.0
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | 0.0
Unrealized losses more than 12 months, fair value | 82.4 | 218.7
Unrealized losses more than 12 months, gross unrealized losses | (1.9) | (3.7)
Total unrealized losses, fair value | 89.4 | 218.7
Total unrealized losses, gross unrealized losses | (1.9) | (3.7)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 37.2 | 178.1
Unrealized losses less than 12 months, gross unrealized losses | (0.1) | (1.2)
Unrealized losses more than 12 months, fair value | 15.4 | 106.7
Unrealized losses more than 12 months, gross unrealized losses | (0.4) | (1.2)
Total unrealized losses, fair value | 52.6 | 284.8
Total unrealized losses, gross unrealized losses | (0.5) | (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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