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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Sep. 08, 2017 USD ($)
Subsidiaries \| Denver Transit, Installation of Constant Wireless Crossings \| Threatened Litigation
Loss Contingencies [Line Items]
Damages alleged	$ 37

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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