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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |
Revenue, remaining performance obligation | $ 82.7 |  |
Increase (decrease) in contract with customers, net | 6.0 |  |
Contract with customer, revenue recognized | $ 34.1 |  |
Engineered Solutions segment | South African projects |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer contract terms | 10 years |  |
Minimum | Engineered Solutions segment | Power transformers |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer contract terms | 6 months |  |
Minimum | Engineered Solutions segment | Process cooling equipment and services, and heat exchangers |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer contract terms | 6 months |  |
Maximum | Engineered Solutions segment | Power transformers |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer contract terms | 1 year |  |
Maximum | Engineered Solutions segment | Process cooling equipment and services, and heat exchangers |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer contract terms | 1 year 6 months |  |
SOUTH AFRICA | Large Power Projects |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue recognized | $ 44.5 |  |
Scenario, Forecast |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue remaining performance obligation percentage |  | 92.00% | 61.00%

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