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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 01, 2016
Apr. 02, 2016
Sep. 26, 2015
Oct. 01, 2016
Sep. 26, 2015
Dec. 31, 2015
Intangible assets with determinable lives            
Gross Carrying Value $ 64,100,000     $ 64,100,000   $ 84,900,000
Accumulated Amortization (33,000,000) [1]     (33,000,000) [1]   (47,400,000)
Net Carrying Value 31,100,000     31,100,000   37,500,000
Intangible assets with indefinite lives            
Gross carrying value, Total [1] 178,100,000     178,100,000    
Net Carrying Value, Total 145,100,000 [1]     145,100,000 [1]   154,200,000
Impairment of intangible assets 0   $ 0 4,000,000 $ 0  
Impairment charges         $ 0  
SPX Heat Transfer Business            
Intangible assets with determinable lives            
Net Carrying Value 26,700,000     26,700,000    
Assets from Continuing Operations and Disposal Group, Held-for-sale, Not Discontinued Operations            
Intangible assets with determinable lives            
Accumulated Amortization [1]           (47,400,000)
Intangible assets with indefinite lives            
Gross carrying value, Total [1]           209,900,000
Net Carrying Value, Total [1]           162,500,000
HVAC segment            
Intangible assets with determinable lives            
Net Carrying Value 4,400,000     4,400,000    
Intangible assets with indefinite lives            
Trademarks 89,200,000     89,200,000    
Detection and Measurement segment            
Intangible assets with indefinite lives            
Trademarks 10,200,000     10,200,000    
Power segment            
Intangible assets with determinable lives            
Net Carrying Value 26,700,000     26,700,000    
Intangible assets with indefinite lives            
Trademarks 14,600,000     14,600,000    
Trademarks with indefinite lives            
Intangible assets with indefinite lives            
Trademarks [2],[3] 114,000,000     114,000,000   125,000,000
Trademarks with indefinite lives | SPX Heat Transfer Business            
Intangible assets with indefinite lives            
Trademarks           9,500,000
Impairment of intangible assets   $ 4,000,000        
Trademarks with indefinite lives | Assets Held For Sale, Current | Disposal Group, Held-for-sale, Not Discontinued Operations            
Intangible assets with indefinite lives            
Trademarks           5,900,000
Customer relationships            
Intangible assets with determinable lives            
Gross Carrying Value 25,400,000     25,400,000   25,400,000
Accumulated Amortization (10,500,000)     (10,500,000)   (9,500,000)
Net Carrying Value 14,900,000     14,900,000   15,900,000
Technology            
Intangible assets with determinable lives            
Gross Carrying Value [3] 20,800,000     20,800,000   40,700,000
Accumulated Amortization [3] (10,100,000)     (10,100,000)   (25,200,000)
Net Carrying Value [3] 10,700,000     10,700,000   15,500,000
Technology | Assets Held For Sale, Current | Disposal Group, Held-for-sale, Not Discontinued Operations            
Intangible assets with determinable lives            
Net Carrying Value           2,400,000
Patents            
Intangible assets with determinable lives            
Gross Carrying Value 4,600,000     4,600,000   4,600,000
Accumulated Amortization (4,600,000)     (4,600,000)   (4,600,000)
Net Carrying Value 0     0   0
Other            
Intangible assets with determinable lives            
Gross Carrying Value 13,300,000     13,300,000   14,200,000
Accumulated Amortization (7,800,000)     (7,800,000)   (8,100,000)
Net Carrying Value $ 5,500,000     $ 5,500,000   $ 6,100,000
[1] Changes in the gross carrying values of “Other Intangibles, Net” during the nine months ended October 1, 2016 related to the sale of our dry cooling business, the impairment charge related to the Heat Transfer trademarks noted above, and, to a lesser extent, foreign currency translation.
[2] As noted below, we recorded an impairment charge of $4.0 during the first quarter of 2016 related to the trademarks of our Heat Transfer business.
[3] The net carrying value at December 31, 2015 includes $2.4 and $5.9 of technology and trademarks, respectively, related to our dry cooling business. As previously noted, the assets and liabilities of the dry cooling business have been classified as “held for sale” in the accompanying condensed consolidated balance sheet as of December 31, 2015. See Note 3 for information on the assets and liabilities of the dry cooling business as of December 31, 2015.