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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 4,279.4	$ 3,861.7
Gross Unrealized Gains	0.6	0.2
Gross Unrealized Losses	(20.4)	(15.4)
Fair Value	4,259.6	3,846.5
Cash and Cash Equivalents	1,203.5	648.2
Short- term Investments	1,729.0	1,312.4
Long- term Investments	1,327.1	1,885.9
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	242.0	197.7
Fair Value	242.0	197.7
Cash and Cash Equivalents	242.0	197.7
Level 1
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,931.2	1,474.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(8.1)	(4.7)
Fair Value	1,923.1	1,469.4
Cash and Cash Equivalents	802.1	450.5
Short- term Investments	627.2	396.2
Long- term Investments	493.8	622.7
Level 1 | Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	738.7	445.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	738.7	445.0
Cash and Cash Equivalents	738.7	445.0
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]
Amortized Cost	1,192.5	1,029.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(8.1)	(4.7)
Fair Value	1,184.4	1,024.4
Cash and Cash Equivalents	63.4	5.5
Short- term Investments	627.2	396.2
Long- term Investments	493.8	622.7
Level 2
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,106.2	2,189.9
Gross Unrealized Gains	0.6	0.2
Gross Unrealized Losses	(12.3)	(10.7)
Fair Value	2,094.5	2,179.4
Cash and Cash Equivalents	159.4	0.0
Short- term Investments	1,101.8	916.2
Long- term Investments	833.3	1,263.2
Level 2 | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	170.2	38.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	170.2	38.4
Cash and Cash Equivalents	112.9	0.0
Short- term Investments	57.3	38.4
Long- term Investments	0.0	0.0
Level 2 | Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,036.2	946.6
Gross Unrealized Gains	0.4	0.2
Gross Unrealized Losses	(6.1)	(4.4)
Fair Value	1,030.5	942.4
Cash and Cash Equivalents	3.2	0.0
Short- term Investments	581.1	403.9
Long- term Investments	446.2	538.5
Level 2 | U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	882.3	901.3
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	(6.2)	(4.4)
Fair Value	876.3	896.9
Cash and Cash Equivalents	43.3	0.0
Short- term Investments	454.1	311.7
Long- term Investments	378.9	585.2
Level 2 | Non-U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2.5
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Fair Value		2.5
Cash and Cash Equivalents		0.0
Short- term Investments		2.5
Long- term Investments		0.0
Level 2 | Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17.5	301.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	(1.9)
Fair Value	17.5	299.2
Cash and Cash Equivalents	0.0	0.0
Short- term Investments	9.3	159.7
Long- term Investments	$ 8.2	$ 139.5

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