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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | $ 2,035.6 | $ 1,167.6
Total | 4,188.3 |
Total assets measured at fair value, Amortized Cost | 6,017.7 | 5,818.1
Gross Unrealized Gains | 58.7 | 27.9
Gross Unrealized Losses | (0.3) | (0.8)
Allowance for Credit Loss | 1.3 |
Total assets measured at fair value, Fair Value | 6,074.8 | 5,845.2
Short- term Investments | 2,452.7 | 2,054.1
Long- term Investments | 1,586.5 | 2,623.5
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 562.6 | 413.1
Fair Value | 562.6 | 413.1
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 1,389.3 | 726.8
Total | 3,264.2 | 2,662.6
Gross Unrealized Gains | 35.0 | 9.7
Gross Unrealized Losses | 0.0 | (0.4)
Allowance for Credit Loss | 0.0 |
Fair Value | 3,299.2 | 2,671.9
Short- term Investments | 1,023.1 | 890.8
Long- term Investments | 886.8 | 1,054.3
Level 1 | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 1,266.8 | 726.8
Fair Value | 1,266.8 | 726.8
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 | 122.5 | 0.0
Total | 1,997.4 | 1,935.8
Gross Unrealized Gains | 35.0 | 9.7
Gross Unrealized Losses | 0.0 | (0.4)
Allowance for Credit Loss | 0.0 |
Fair Value | 2,032.4 | 1,945.1
Short- term Investments | 1,023.1 | 890.8
Long- term Investments | 886.8 | 1,054.3
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 83.7 | 27.7
Total | 2,190.9 | 2,742.4
Gross Unrealized Gains | 23.7 | 18.2
Gross Unrealized Losses | (0.3) | (0.4)
Allowance for Credit Loss | 1.3 |
Fair Value | 2,213.0 | 2,760.2
Short- term Investments | 1,429.6 | 1,163.3
Long- term Investments | 699.7 | 1,569.2
Level 2 | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 26.6 | 25.5
Total | 269.7 | 165.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Allowance for Credit Loss | 0.0 |
Fair Value | 269.7 | 165.1
Short- term Investments | 243.1 | 139.6
Long- term Investments | 0.0 | 0.0
Level 2 | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 7.1 | 0.0
Total | 1,436.2 | 2,096.1
Gross Unrealized Gains | 18.0 | 16.8
Gross Unrealized Losses | (0.3) | (0.2)
Allowance for Credit Loss | 1.3 |
Fair Value | 1,452.6 | 2,112.7
Short- term Investments | 972.3 | 798.5
Long- term Investments | 473.2 | 1,314.2
Level 2 | U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 50.0 | 0.0
Total | 410.7 | 418.3
Gross Unrealized Gains | 3.6 | 1.1
Gross Unrealized Losses | 0.0 | (0.2)
Allowance for Credit Loss | 0.0 |
Fair Value | 414.3 | 419.2
Short- term Investments | 202.4 | 209.6
Long- term Investments | 161.9 | 209.6
Level 2 | Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 4.5 | 4.5
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Allowance for Credit Loss | 0.0 |
Fair Value | 4.5 | 4.5
Short- term Investments | 4.5 | 4.5
Long- term Investments | 0.0 | 0.0
Level 2 | Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 0.0 | 2.2
Total | 69.8 | 58.4
Gross Unrealized Gains | 2.1 | 0.3
Gross Unrealized Losses | 0.0 | 0.0
Allowance for Credit Loss | 0.0 |
Fair Value | 71.9 | 58.7
Short- term Investments | 7.3 | 11.1
Long- term Investments | $ 64.6 | $ 45.4

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