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RELATED PARTY TRANSACTIONS Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2011
Related Party Transaction [Line Items] |  |  |  |  |
Proceeds from divestiture of businesses | $ 38.0 |  |  |  |
Gain (loss) on disposition of business | $ 10.9 |  |  |  |
Corporate Joint Venture |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases from related party |  | $ 0.6 | $ 2.0 | $ 2.0 |
Training Services | Equity Method Investee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Notes receivable to related party |  |  | 3.7 |  |
Dart Holding Company Ltd. |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related party |  |  | 27.1 | 2.0 |
Dart Holding Company Ltd. | Equity Method Investee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Notes receivable to related party |  |  | 2.3 |  | $ 5.1
Era Training Center | Helicopter, Management and Other Services | Equity Method Investee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related party |  |  | 0.1 | 0.2 |
Era Training Center | Training Services | Equity Method Investee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related party |  |  | $ 0.2 | $ 0.5 |

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