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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |  |
Revenue, remaining performance obligation | $ 71.4 | $ 71.4 |  |
Increase (decrease) in contract with customers, net |  | 45.3 |  |
Contract with customer, revenue recognized | 15.8 | $ 49.9 |  |
Engineered Solutions segment | South African projects |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Customer contract terms |  | 10 years |  |
Minimum | HVAC segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Customer contract terms |  | 1 month |  |
Minimum | Detection and Measurement segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Customer contract terms |  | 1 month |  |
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 | HVAC segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Customer contract terms |  | 3 months |  |
Maximum | Detection and Measurement segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Customer contract terms |  | 18 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 | $ 38.2 | $ 38.2 |  |
Scenario, Forecast |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue remaining performance obligation percentage |  |  | 94.00% | 63.00%

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