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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Changes in Equity    
Equity, beginning of period $ 314.7  
Net income 12.4 $ 17.4
Stranded income tax effects resulting from tax reform (4.8) 0.0
Equity, end of period 333.2  
Derivatives qualifying as hedges, tax 0.4 (0.4)
Defined benefit plan, after reclassification adjustment, tax 4.9 0.0
SPX Corporation Shareholders' Equity    
Changes in Equity    
Equity, beginning of period 314.7 191.6
Net income 12.4 17.4
Net unrealized gains (losses) on qualifying cash flow hedges, net of tax (provision) benefit of $0.4 and $(0.4) for the three months ended March 31, 2018 and April 1, 2017, respectively (0.5) 0.7
Pension and postretirement liability adjustment, net of tax benefit of $4.9 for the three months ended March 31, 2018 3.9 (0.2)
Foreign currency translation adjustments 1.0 (1.5)
Total comprehensive income, net 16.8 16.4
Incentive plan activity 3.0 3.8
Long-term incentive compensation expense 3.0 2.8
Restricted stock and restricted stock unit vesting, net of tax withholdings (3.3) (3.6)
Equity, end of period 333.2 211.0
Accounting Standards Update 2014-09    
Changes in Equity    
Cumulative effect of new accounting principle in period of adoption   0.0
Accounting Standards Update 2014-09 | SPX Corporation Shareholders' Equity    
Changes in Equity    
Cumulative effect of new accounting principle in period of adoption 4.0  
Accounting Standards Update 2016-16 | SPX Corporation Shareholders' Equity    
Changes in Equity    
Cumulative effect of new accounting principle in period of adoption $ (0.2) $ 0.0