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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%