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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	Sep. 08, 2017 USD ($)	Dec. 31, 2020 claim
Threatened Litigation | Denver Transit Installation of Constant Wireless Crossings | Subsidiaries
Loss Contingencies [Line Items]
Alleged damages | $	$ 36.8
Pending Litigation
Loss Contingencies [Line Items]
Pending litigation cases | claim		0

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Number of pending claims pertaining to a loss contingency.

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