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BASIS OF PRESENTATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 01, 2019
Jun. 07, 2018
Mar. 01, 2018
Mar. 30, 2019
Mar. 31, 2018
Discontinued Operations          
Business acquisition, net of cash acquired       $ 77.0 $ 16.3
Length of second and third quarter       91 days  
Sabik Marine          
Discontinued Operations          
Business acquisition, net of cash acquired $ 77.0        
Cash acquired $ 0.6        
Cues, Inc.          
Discontinued Operations          
Business acquisition, net of cash acquired   $ 164.4      
Cash acquired   $ 20.6      
Schonstedt          
Discontinued Operations          
Business acquisition, net of cash acquired     $ 16.4    
Cash acquired     $ 0.3    
Building | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations          
Discontinued Operations          
Proceeds from sale of manufacturing facility       $ 5.5  
Gain (loss) on disposition of manufacturing facility       $ 0.3