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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | $ 875.7 | $ 857.9
Total | 4,199.0 |
Total assets measured at fair value, Amortized Cost | 5,059.7 | 4,845.0
Gross Unrealized Gains | 11.7 | 3.3
Gross Unrealized Losses | (6.8) | (13.9)
Total assets measured at fair value, Fair Value | 5,064.6 | 4,834.4
Short- term Investments | 1,933.0 | 2,205.2
Long- term Investments | 2,255.9 | 1,771.3
Cash |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 251.5 | 269.4
Fair Value | 251.5 | 269.4
Level 1 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 621.2 | 579.1
Total | 2,191.4 | 2,046.9
Gross Unrealized Gains | 3.7 | 1.7
Gross Unrealized Losses | (3.0) | (5.3)
Fair Value | 2,192.1 | 2,043.3
Short- term Investments | 794.0 | 897.8
Long- term Investments | 776.9 | 566.4
Level 1 | Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 609.2 | 569.1
Fair Value | 609.2 | 569.1
Short- term Investments | 0.0 | 0.0
Long- term Investments | 0.0 | 0.0
Level 1 | U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 12.0 | 10.0
Total | 1,582.2 | 1,477.8
Gross Unrealized Gains | 3.7 | 1.7
Gross Unrealized Losses | (3.0) | (5.3)
Fair Value | 1,582.9 | 1,474.2
Short- term Investments | 794.0 | 897.8
Long- term Investments | 776.9 | 566.4
Level 2 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 3.0 | 9.4
Total | 2,616.8 | 2,528.7
Gross Unrealized Gains | 8.0 | 1.6
Gross Unrealized Losses | (3.8) | (8.6)
Fair Value | 2,621.0 | 2,521.7
Short- term Investments | 1,139.0 | 1,307.4
Long- term Investments | 1,479.0 | 1,204.9
Level 2 | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 3.0 | 1.4
Total | 97.3 | 110.7
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 97.3 | 110.7
Short- term Investments | 94.3 | 109.3
Long- term Investments | 0.0 | 0.0
Level 2 | Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 0.0 | 8.0
Total | 1,786.5 | 1,607.8
Gross Unrealized Gains | 7.3 | 1.3
Gross Unrealized Losses | (1.7) | (4.8)
Fair Value | 1,792.1 | 1,604.3
Short- term Investments | 679.7 | 724.5
Long- term Investments | 1,112.4 | 871.8
Level 2 | U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 709.1 | 791.8
Gross Unrealized Gains | 0.6 | 0.3
Gross Unrealized Losses | (2.1) | (3.8)
Fair Value | 707.6 | 788.3
Short- term Investments | 360.3 | 468.9
Long- term Investments | 347.3 | 319.4
Level 2 | Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 23.9 | 18.4
Gross Unrealized Gains | 0.1 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 24.0 | 18.4
Short- term Investments | 4.7 | 4.7
Long- term Investments | $ 19.3 | 13.7
Prepaids and other current assets |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Restricted cash equivalents |  | $ 36.5

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