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Proposed Merger With GE Transportation (Q3) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 12, 2018 | Sep. 14, 2018 | Jun. 08, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity issued in acquisition |  | $ 25,500 | $ 534,679 | $ 0 |  |  |
Debt issued |  |  |  |  |  | $ 2,500,000 |
Floating Rate Senior Notes | Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | 500,000 |
Senior Notes due 2024 | Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | 750,000 |
Senior Notes due 2028 | Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 1,250,000 |
Delayed Draw Term Loan | Line of Credit |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Delayed draw term loan |  |  |  |  |  |  | $ 400,000
Scenario Forecast | GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment for acquisition | $ 2,900,000 |  |  |  |  |  |
Outstanding shares retained (as a percent) | 49.90% |  |  |  |  |  |
Equity issued in acquisition | $ 9,398,000 |  |  |  |  |  |
Business combination, consideration transferred | $ 12,800,000 |  |  |  |  |  |
Scenario Forecast | GE and Pre-Merger Holders | GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding shares transferred (as a percent) | 50.10% |  |  |  |  |  |
Scenario Forecast | General Electric Company | GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding shares transferred (as a percent) | 9.90% |  |  |  |  |  |
Cash to be received | $ 3,370,000 |  |  |  |  |  |
Subsequent Event | GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Closing sale price (in dollars per share) |  |  |  |  | $ 95.43 |  |
Minimum | Scenario Forecast | General Electric Company | GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Period for reverting shares | 2 years |  |  |  |  |  |
Maximum | Scenario Forecast | General Electric Company | GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Period for reverting shares | 3 years |  |  |  |  |  |

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