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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 USD ($) | Sep. 08, 2017 USD ($) | Dec. 31, 2018 claim
Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Pending litigation cases | claim |  |  | 0
Denver Transit Installation of Constant Wireless Crossings | Threatened Litigation | Subsidiaries |  |  |
Loss Contingencies [Line Items] |  |  |
Alleged damages |  | $ 36.8 |
Asbestos Related Cases | Settled Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Arbitration decisions | claim |  |  | 2
Subsequent Event | Positive Train Control Patents | Siemens Industry, Inc. | Settled Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Damages award to plaintiff | $ 5.6 |  |
Subsequent Event | End of Train Patents | Siemens Industry, Inc. | Settled Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Damages award to plaintiff | $ 1.1 |  |

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