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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 1,914.6 | $ 132.5
Unrealized losses less than 12 months, gross unrealized losses | (12.4) | (0.1)
Unrealized losses more than 12 months, fair value | 1,285.9 | 2,595.1
Unrealized losses more than 12 months, gross unrealized losses | (28.5) | (60.4)
Total unrealized losses, fair value | 3,200.5 | 2,727.6
Total unrealized losses, gross unrealized losses | (40.9) | (60.5)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,736.5 | 48.5
Unrealized losses less than 12 months, gross unrealized losses | (11.8) | 0.0
Unrealized losses more than 12 months, fair value | 526.4 | 1,112.9
Unrealized losses more than 12 months, gross unrealized losses | (11.9) | (25.4)
Total unrealized losses, fair value | 2,262.9 | 1,161.4
Total unrealized losses, gross unrealized losses | (23.7) | (25.4)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 42.9 | 54.2
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (0.1)
Unrealized losses more than 12 months, fair value | 529.2 | 1,219.2
Unrealized losses more than 12 months, gross unrealized losses | (11.5) | (25.8)
Total unrealized losses, fair value | 572.1 | 1,273.4
Total unrealized losses, gross unrealized losses | (11.5) | (25.9)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 135.2 | 29.8
Unrealized losses less than 12 months, gross unrealized losses | (0.6) | 0.0
Unrealized losses more than 12 months, fair value | 170.0 | 185.6
Unrealized losses more than 12 months, gross unrealized losses | (4.6) | (7.3)
Total unrealized losses, fair value | 305.2 | 215.4
Total unrealized losses, gross unrealized losses | (5.2) | (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 | 60.3 | 77.4
Unrealized losses more than 12 months, gross unrealized losses | (0.5) | (1.9)
Total unrealized losses, fair value | 60.3 | 77.4
Total unrealized losses, gross unrealized losses | $ (0.5) | $ (1.9)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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