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FINANCIAL INSTRUMENTS - Summary of Equity Investment Activity (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments with readily determinable value beginning balance, Carrying Value	$ 60.1
Equity investments with readily determinable value beginning balance, Carrying Value	0.0
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	60.1
Changes in Fair Value	11.4
Sales/Purchases/Others	(71.5)
Equity investments with readily determinable value beginning balance, Carrying Value	0.0
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Equity investments without readily determinable value, Carrying Value	30.2
Changes in Fair Value	14.5
Sales/Purchases/Others	3.4
Equity investments without readily determinable value, Carrying Value	48.1
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	0.0
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	$ 48.1

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

+ 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=123594786&loc=SL75136599-209740

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 2: 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=123583765&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
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