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ACQUISITIONS Acquisitions Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Jan. 26, 2017
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 0.0 | $ 113.7 |  |  |
Goodwill | $ 895.7 |  |  | $ 886.8 |
Axtone Railway Components Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jan. 26, 2017 |  |  |  |
Business Acquisition, Name of Acquired Entity | Axtone Railway Components (Axtone) |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 123.1 |  |  |
Revenue of Acquired Entity for Last Annual Period |  |  | $ 72.0 |  |
Goodwill |  |  |  |  | $ 86.0

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