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FINANCIAL INSTRUMENTS - Summary of Equity Investment Activity (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments with readily determinable value beginning balance, Carrying Value	$ 0.0
Equity investments with readily determinable value beginning balance, Carrying Value	65.9
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments with readily determinable value beginning balance, Carrying Value	0.0
Changes in Fair Value	6.1
Sales/Purchases/Others	59.8
Equity investments with readily determinable value beginning balance, Carrying Value	65.9
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments without readily determinable value, Carrying Value	27.9	$ 24.6
Changes in Fair Value	61.5
Sales/Purchases/Others	(58.2)
Prepaids and other current assets | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments with readily determinable value beginning balance, Carrying Value	65.9
Prepaids and other current assets | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments without readily determinable value, Carrying Value	0.0
Intangible and other assets, net | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments with readily determinable value beginning balance, Carrying Value	0.0
Intangible and other assets, net | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments without readily determinable value, Carrying Value	$ 27.9

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

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