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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Changes in Equity        
Equity, beginning of period     $ 314.7  
Net income $ 23.0 $ (9.0) 35.4 $ 8.4
Equity, end of period 358.6   358.6  
Derivatives qualifying as hedges, tax 0.2 0.5 0.6 0.1
Defined benefit plan, after reclassification adjustment, tax 0.3   5.2 0.1
SPX Corporation Shareholders' Equity        
Changes in Equity        
Equity, beginning of period 333.2 211.0 314.7 191.6
Net income 23.0 (9.0) 35.4 8.4
Net unrealized losses on qualifying cash flow hedges, net of tax benefit of $0.6 and $0.1 for the six months ended June 30, 2018 and July 1, 2017, respectively (0.5) (0.9) (1.0) (0.2)
Pension and postretirement liability adjustment, net of tax benefit of $5.2 and $0.1 for the six months ended June 30, 2018 and July 1, 2017, respectively (0.7) (0.1) 3.2 (0.3)
Foreign currency translation adjustments (1.8) 1.1 (0.8) (0.4)
Total comprehensive income, net 20.0 (8.9) 36.8 7.5
Stranded income tax effects resulting from tax reform     (4.8) 0.0
Incentive plan activity 2.3 3.6 5.3 7.4
Long-term incentive compensation expense 3.1 3.0 6.1 5.8
Restricted stock and restricted stock unit vesting, net of tax withholdings     (3.3) (3.6)
Equity, end of period 358.6 208.7 358.6 208.7
Accounting Standards Update 2014-09 | SPX Corporation Shareholders' Equity        
Changes in Equity        
Cumulative effect of new accounting principle in period of adoption 4.0 0.0 4.0 0.0
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 $ (0.2) $ 0.0