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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | $ 3,036.7 | $ 2,750.1
Total | 4,700.9 |
Gross Unrealized Gains | 4.2 | 22.1
Gross Unrealized Losses | (40.9) | (60.5)
Allowance for Credit Loss | (0.1) | (1.1)
Fair Value | 4,664.1 |
Short- term Investments | 1,720.5 | 2,473.1
Long- term Investments | 2,925.9 | 2,120.0
Total assets measured at fair value, amortized cost | 7,719.9 | 7,382.7
Total assets measured at fair value, fair value | 7,683.1 | 7,343.2
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 475.2 | 526.2
Fair Value | 475.2 | 526.2
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 2,561.5 | 2,223.9
Total | 6,082.3 | 5,074.1
Gross Unrealized Gains | 3.7 | 20.1
Gross Unrealized Losses | (23.7) | (25.4)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 6,062.3 | 5,068.8
Short- term Investments | 995.1 | 1,276.0
Long- term Investments | 2,505.7 | 1,568.9
Level 1 | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 2,543.8 | 2,223.9
Fair Value | 2,543.8 | 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 | 17.7 | 0.0
Total | 3,538.5 | 2,850.2
Gross Unrealized Gains | 3.7 | 20.1
Gross Unrealized Losses | (23.7) | (25.4)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 3,518.5 | 2,844.9
Short- term Investments | 995.1 | 1,276.0
Long- term Investments | 2,505.7 | 1,568.9
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 1,162.4 | 1,782.4
Gross Unrealized Gains | 0.5 | 2.0
Gross Unrealized Losses | (17.2) | (35.1)
Allowance for Credit Loss | (0.1) | (1.1)
Fair Value | 1,145.6 | 1,748.2
Short- term Investments | 725.4 | 1,197.1
Long- term Investments | 420.2 | 551.1
Level 2 | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 625.6 | 1,300.4
Gross Unrealized Gains | 0.1 | 0.0
Gross Unrealized Losses | (11.5) | (25.8)
Allowance for Credit Loss | (0.1) | (1.1)
Fair Value | 614.1 | 1,273.5
Short- term Investments | 472.3 | 974.6
Long- term Investments | 141.8 | 298.9
Level 2 | U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 476.0 | 402.6
Gross Unrealized Gains | 0.4 | 2.0
Gross Unrealized Losses | (5.2) | (7.3)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 471.2 | 397.3
Short- term Investments | 194.1 | 149.5
Long- term Investments | 277.1 | 247.8
Level 2 | Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 60.8 | 79.4
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.5) | (2.0)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 60.3 | 77.4
Short- term Investments | 59.0 | 73.0
Long- term Investments | $ 1.3 | $ 4.4

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