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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | $ 2,413.3 | $ 2,750.1
Total | 5,995.1 |
Gross Unrealized Gains | 54.9 | 22.1
Gross Unrealized Losses | (14.6) | (60.5)
Allowance for Credit Loss | (0.1) | (1.1)
Fair Value | 6,035.3 |
Short- term Investments | 1,818.4 | 2,473.1
Long- term Investments | 4,079.8 | 2,120.0
Total assets measured at fair value, amortized cost | 8,271.3 | 7,382.7
Total assets measured at fair value, fair value | 8,311.5 | 7,343.2
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 566.8 | 526.2
Fair Value | 566.8 | 526.2
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 1,846.5 | 2,223.9
Total | 6,755.3 | 5,074.1
Gross Unrealized Gains | 50.2 | 20.1
Gross Unrealized Losses | (7.0) | (25.4)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 6,798.5 | 5,068.8
Short- term Investments | 1,347.0 | 1,276.0
Long- term Investments | 3,605.0 | 1,568.9
Level 1 | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 1,709.4 | 2,223.9
Fair Value | 1,709.4 | 2,223.9
Short- term Investments | 0.0 | 0.0
Long- term Investments | 0.0 | 0.0
Level 1 | U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 137.1 | 0.0
Total | 5,045.9 | 2,850.2
Gross Unrealized Gains | 50.2 | 20.1
Gross Unrealized Losses | (7.0) | (25.4)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 5,089.1 | 2,844.9
Short- term Investments | 1,347.0 | 1,276.0
Long- term Investments | 3,605.0 | 1,568.9
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 949.2 | 1,782.4
Gross Unrealized Gains | 4.7 | 2.0
Gross Unrealized Losses | (7.6) | (35.1)
Allowance for Credit Loss | (0.1) | (1.1)
Fair Value | 946.2 | 1,748.2
Short- term Investments | 471.4 | 1,197.1
Long- term Investments | 474.8 | 551.1
Level 2 | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 393.7 | 1,300.4
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (5.1) | (25.8)
Allowance for Credit Loss | (0.1) | (1.1)
Fair Value | 388.5 | 1,273.5
Short- term Investments | 294.5 | 974.6
Long- term Investments | 94.0 | 298.9
Level 2 | U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 540.7 | 402.6
Gross Unrealized Gains | 4.7 | 2.0
Gross Unrealized Losses | (2.4) | (7.3)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 543.0 | 397.3
Short- term Investments | 163.6 | 149.5
Long- term Investments | 379.4 | 247.8
Level 2 | Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 14.8 | 79.4
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | (2.0)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 14.7 | 77.4
Short- term Investments | 13.3 | 73.0
Long- term Investments | $ 1.4 | $ 4.4

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