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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | Aug. 15, 2019 USD ($) | Jan. 31, 2019 USD ($) | Sep. 08, 2017 USD ($) | Dec. 31, 2019 claim
--- | --- | --- | --- | ---
Settled Litigation | Siemens Industry, Inc. |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages award to plaintiff | $ 14.1 |  |  |
Pending Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Pending litigation cases | claim |  |  |  | 0
Threatened Litigation | Denver Transit Installation of Constant Wireless Crossings | Subsidiaries |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Alleged damages |  |  | $ 36.8 |
Positive Train Control Patents | Settled Litigation | Siemens Industry, Inc. |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages award to plaintiff |  | $ 5.6 |  |
End of Train Patents | Settled Litigation | Siemens Industry, Inc. |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages award to plaintiff |  | $ 1.1 |  |

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