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Employee Benefit Plans - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jul. 02, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Individual Account Retirement Plan (SIARP)          
Employee benefit plans          
Percentage of projected benefit obligation that was settled   22.00%      
Settlements   $ 2.7      
Charge to net periodic pension benefit expense         $ 0.8
United States          
Employee benefit plans          
Settlements     $ 11.1 $ 0.0  
Plan amendment     $ 0.0 $ 0.0  
United States | SPX Flow, Inc | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff          
Employee benefit plans          
Percentage of projected benefit obligation that was settled   9.00%      
Settlements   $ 25.2      
Charge to net periodic pension benefit expense         $ 1.0
U.S. Postretirement Plan (“OPEB”)          
Employee benefit plans          
Plan amendment $ (26.8)        
(Increase) decrease for remeasurement due to settlement $ 2.6