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FINANCIAL INSTRUMENTS - Summary of Equity Investment Activity (Details) $ in Millions | 6 Months Ended
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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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