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Employee Benefit Plans - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 14, 2015
Sep. 30, 2017
Jul. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee benefit plans            
Amount of curtailment gain $ 5.1         $ 5.1
Charge to net periodic pension benefit expense from remeasurement of assets and liabilities of US Plan and SIARP           $ 11.4
Supplemental Individual Account Retirement Plan (SIARP)            
Employee benefit plans            
Percentage of projected benefit obligation that was settled     22.00%      
Settlement charges     $ 2.7      
Charge to net periodic pension benefit expense     $ 0.8      
United States            
Employee benefit plans            
Settlement charges       $ 0.0 $ 36.4  
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%      
Settlement charges     $ 25.2      
Charge to net periodic pension benefit expense     $ 1.0      
U.S. Postretirement Plan (“OPEB”)            
Employee benefit plans            
Plan amendment   $ (26.8)   $ 26.8    
(Increase) decrease for remeasurement due to settlement   $ 2.6