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CONTINGENT LIABILITIES AND OTHER MATTERS (Details 3)
ZAR in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2016
USD ($)
Sep. 26, 2015
USD ($)
Oct. 01, 2016
USD ($)
Sep. 26, 2015
USD ($)
Oct. 01, 2016
ZAR
Jul. 06, 2016
ZAR
Noncontrolling Interest [Line Items]            
Adjustment related to redeemable noncontrolling interest $ 0.0 $ 0.0 $ 18.1 $ 0.0    
SPX Technologies | BEE Partner | South Africa            
Noncontrolling Interest [Line Items]            
Amount due from BEE Partner under promissory note | ZAR           ZAR 30.3
SPX Technologies | BEE Partner | South Africa | Put Option            
Noncontrolling Interest [Line Items]            
Non-controlling interest percentage 25.10%   25.10%   25.10%  
Amount entitled for Put Option exercise | ZAR           ZAR 287.3
Net redemption value $ 18.8   $ 18.8   ZAR 257.0  
Amount reclassified from noncontrolling interests to paid in capital     38.7      
Adjustment related to redeemable noncontrolling interest     $ 18.1