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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | $ 1,615.5 | $ 1,622.6
Total | 6,131.6 |
Total assets measured at fair value, Amortized Cost | 7,716.9 | 6,829.9
Gross Unrealized Gains | 22.8 | 39.4
Gross Unrealized Losses | (4.9) | (0.2)
Allowance for Credit Loss | 0.0 | 0.0
Total assets measured at fair value, Fair Value | 7,734.8 | 6,869.1
Short- term Investments | 2,823.7 | 3,488.8
Long- term Investments | 3,295.6 | 1,757.7
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 717.6 | 644.3
Fair Value | 717.6 | 644.3
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 870.7 | 838.3
Total | 3,389.4 | 3,252.6
Gross Unrealized Gains | 13.5 | 23.0
Gross Unrealized Losses | (2.4) | 0.0
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 3,400.5 | 3,275.6
Short- term Investments | 962.4 | 1,567.9
Long- term Investments | 1,567.4 | 869.4
Level 1 | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 867.7 | 625.8
Fair Value | 867.7 | 625.8
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 | 3.0 | 212.5
Total | 2,521.7 | 2,626.8
Gross Unrealized Gains | 13.5 | 23.0
Gross Unrealized Losses | (2.4) | 0.0
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 2,532.8 | 2,649.8
Short- term Investments | 962.4 | 1,567.9
Long- term Investments | 1,567.4 | 869.4
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 27.2 | 140.0
Total | 3,609.9 | 2,933.0
Gross Unrealized Gains | 9.3 | 16.4
Gross Unrealized Losses | (2.5) | (0.2)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 3,616.7 | 2,949.2
Short- term Investments | 1,861.3 | 1,920.9
Long- term Investments | 1,728.2 | 888.3
Level 2 | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 27.2 | 64.1
Total | 749.1 | 671.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 749.1 | 671.3
Short- term Investments | 721.9 | 607.2
Long- term Investments | 0.0 | 0.0
Level 2 | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 3.4
Total | 2,086.3 | 1,425.4
Gross Unrealized Gains | 6.9 | 11.9
Gross Unrealized Losses | (2.0) | (0.2)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 2,091.2 | 1,437.1
Short- term Investments | 888.6 | 1,036.5
Long- term Investments | 1,202.6 | 397.2
Level 2 | U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 72.5
Total | 580.4 | 716.5
Gross Unrealized Gains | 0.9 | 2.5
Gross Unrealized Losses | (0.3) | 0.0
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 581.0 | 719.0
Short- term Investments | 178.0 | 233.6
Long- term Investments | 403.0 | 412.9
Level 2 | Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 194.1 | 119.8
Gross Unrealized Gains | 1.5 | 2.0
Gross Unrealized Losses | (0.2) | 0.0
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 195.4 | 121.8
Short- term Investments | 72.8 | 43.6
Long- term Investments | $ 122.6 | $ 78.2

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