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Investment in Joint Venture (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Jan. 07, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investment in joint venture under equity method investment          
Depreciation and amortization     $ 114.8 $ 107.6 $ 82.7
EGS Electrical Group, LLC and Subsidiaries ("EGS")
          
Investment in joint venture under equity method investment          
Percentage of interest held in joint venture     44.50%    
Lag in including results in consolidated statements     3 months    
Revenues     517.5 527.0 495.3
Gross profit     223.3 221.9 201.5
Income from continuing operations     89.4 87.9 63.7
Net income     89.4 87.9 63.7
Capital expenditures     13.3 12.0 16.7
Depreciation and amortization     11.0 10.4 10.3
Dividends received by SPX     30.3 35.2 29.4
Undistributed earnings attributable to SPX Corporation     20.0 8.4 4.6
SPX's equity earnings in EGS     41.9 39.0 28.7
Carrying value of investment     81.8 73.5  
Difference between investment in joint venture and proportionate share of joint venture's net assets     89.4    
Condensed balance sheet information of EGS          
Current assets     180.4 183.5  
Non-current assets     336.4 339.6  
Current liabilities     108.0 116.9  
Non-current liabilities     24.0 33.0  
Percentage of interest held in joint venture sold 44.50%        
Proceeds from sale of interest in joint venture 574.1        
Gain on sale of interest in joint venture, net of tax   $ 300.0