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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 01, 2016
Jul. 02, 2016
Sep. 26, 2015
Oct. 01, 2016
Sep. 26, 2015
Domestic Pension Plans          
Net periodic pension/postretirement benefit expense          
Service cost $ 0.1   $ 0.4 $ 0.3 $ 2.2
Interest cost 3.3   4.3 10.4 12.9
Expected return on plan assets (3.2)   (4.5) (9.6) (14.3)
Curtailment gain [1] 0.0   (5.1) 0.0 (5.1)
Recognized net actuarial loss [2] 0.0   11.4 1.8 11.4
Amortization of unrecognized prior service credits (0.1)   0.0 (0.1) 0.0
Total net periodic pension benefit (income) expense 0.1   6.5 2.8 7.1
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 1.2
Interest cost 1.4   2.0 4.3 6.0
Expected return on plan assets (1.5)   (2.4) (5.0) (7.3)
Recognized net actuarial loss 0.0   0.7 0.0 0.7
Total net periodic pension benefit (income) expense (0.1)   0.7 (0.7) 0.6
Less: Net periodic pension benefit expense of discontinued operations 0.0   0.7 0.0 2.0
Net periodic pension benefit income of continuing operations (0.1)   0.0 (0.7) (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 3.2 3.3
Amortization of unrecognized prior service credits (0.2)   (0.2) (0.6) (0.6)
Total net periodic pension benefit (income) expense $ 0.9   $ 0.9 $ 2.6 $ 2.7
[1] Represents a curtailment gain recorded during the third quarter of 2015 in connection with the amendments of the U.S. Plan and SIARP noted above.
[2] Represents actuarial losses resulting from the remeasurement of the assets and obligations of the U.S. Plan and the SIARP during the second quarter of 2016 and third quarter of 2015, which was required in connection with the lump-sum payments and plan amendments noted above.