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INCOME TAXES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
M
Jul. 02, 2011
Operating Loss Carryforwards        
Impairment of goodwill and other intangible assets   $ 24.7   $ 24.7
Income tax benefit resulting from settlement with taxing authority recorded in continuing operations (1.8)      
Uncertain Tax Positions        
Gross unrecognized tax benefits 85.5   85.5  
Net unrecognized tax benefits 66.7   66.7  
Portion of unrecognized benefits which, if recognized, would impact future effective tax rates 66.2   66.2  
Gross accrued interest 13.9   13.9  
Net accrued interest 11.0   11.0  
Reasonably possible amount that unrecognized tax benefits could decrease within next twelve months, low end of range 30.0   30.0  
Reasonably possible amount that unrecognized tax benefits could decrease within next twelve months, high end of range 40.0   40.0  
Other Tax Matters        
Effective income tax rate (as a percent) 19.50% 15.80% 32.50% 25.30%
Favorable impact effective income tax rate related to uncertain tax positions     (2.5)  
Tax benefits associated with the conclusion of a Canadian appeals process   2.5    
Period within which federal income tax returns related matters are expected to be resolved (in months)     12  
Effective income tax rate impacted unfavorably by an incremental tax charge     6.1  
SPX Heat Transfer Inc.
        
Operating Loss Carryforwards        
Impairment of goodwill and other intangible assets   24.7    
Income tax benefit associated with impairment charge on goodwill and intangible assets   $ 9.8    
Minimum
        
Operating Loss Carryforwards        
State income tax returns subject to examination for a period (in years)     3  
Minimum number of matters whose unfavorable resolution could have material adverse effect on the results of operations or cash flows (in matters) 1   1  
Maximum
        
Operating Loss Carryforwards        
State income tax returns subject to examination for a period (in years)     5  
Maximum period for which impact on state income tax returns of any federal changes remains subject to examination by various states (in years)     1