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Investments in Joint Ventures (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 07, 2014
Mar. 29, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Investment in joint venture under equity method investment            
Depreciation and amortization     $ 39.2 $ 43.4 $ 45.7  
SPX's equity earnings in EGS     $ 1.4 1.4 $ 42.2  
EGS Electrical Group, LLC and Subsidiaries ("EGS")            
Investment in joint venture under equity method investment            
Percentage of interest held in joint venture 44.50%       44.50%  
Lag in including results in consolidated statements         3 months  
Proceeds from sale of interest in joint venture $ 574.1 $ 574.1        
Gain on sale of interest in joint venture   $ 491.2   491.2    
Revenues           $ 517.5
Gross profit           223.3
Income from continuing operations           89.4
Net income           89.4
Capital expenditures           13.3
Depreciation and amortization           11.0
Dividends received by SPX           30.3
Undistributed earnings attributable to SPX Corporation           20.0
SPX's equity earnings in EGS       $ 0.0   $ 41.9