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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jun. 27, 2015
Jul. 02, 2016
Jun. 27, 2015
Domestic Pension Plans        
Net periodic pension/postretirement benefit expense        
Service cost $ 0.1 $ 0.9 $ 0.2 $ 1.8
Interest cost 3.5 4.3 7.1 8.6
Expected return on plan assets (3.2) (4.9) (6.4) (9.8)
Recognized net actuarial loss 1.8 0.0 1.8 0.0
Net periodic pension benefit (income) expense $ 2.2 0.3 2.7 0.6
Domestic Pension Plans | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SPX Flow, Inc        
Employee Benefit Plans        
Percentage of projected benefit obligation 9.00%      
Lump sum payment in lieu of future pension benefit $ 25.2      
Charge to net periodic pension benefit expense $ 1.0      
SIARP        
Employee Benefit Plans        
Percentage of projected benefit obligation 22.00%      
Lump sum payment in lieu of future pension benefit $ 2.7      
Charge to net periodic pension benefit expense 0.8      
Foreign Pension Plans        
Net periodic pension/postretirement benefit expense        
Service cost 0.0 0.4 0.0 0.8
Interest cost 1.5 2.0 2.9 4.0
Expected return on plan assets (1.8) (2.5) (3.5) (4.9)
Net periodic pension benefit (income) expense (0.3) (0.1) (0.6) (0.1)
Less: Net periodic pension benefit expense of discontinued operations 0.0 0.6 0.0 1.3
Net periodic pension benefit income of continuing operations (0.3) (0.7) (0.6) (1.4)
Postretirement Plans        
Net periodic pension/postretirement benefit expense        
Service cost 0.0 0.0 0.0 0.0
Interest cost 1.1 1.1 2.1 2.2
Amortization of unrecognized prior service credits (0.2) (0.2) (0.4) (0.4)
Net periodic pension benefit (income) expense $ 0.9 $ 0.9 $ 1.7 $ 1.8