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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Changes in Equity        
Equity, beginning of period     $ 314.7  
Net income $ 6.6 $ 22.3 42.0 $ 30.7
Equity, end of period 369.7   369.7  
Derivatives qualifying as hedges, tax 0.0 0.3 0.6 (0.2)
Defined benefit plan, after reclassification adjustment, tax 0.1 (10.3) 5.3 (10.2)
SPX Corporation Shareholders' Equity        
Changes in Equity        
Equity, beginning of period 358.6 208.7 314.7 191.6
Net income 6.6 22.3 42.0 30.7
Net unrealized gains (losses) on qualifying cash flow hedges, net of tax (provision) benefit of $0.6 and ($0.2) for the nine months ended September 29, 2018 and September 30, 2017, respectively (0.1) 0.5 (1.1) 0.3
Pension and postretirement liability adjustment, net of tax (provision) benefit of $5.3 and $(10.2) for the nine months ended September 29, 2018 and September 30, 2017, respectively (0.9) 16.2 2.3 15.9
Foreign currency translation adjustments 0.0 2.4 (0.8) 2.0
Total comprehensive income 5.6 41.4 42.4 48.9
Stranded income tax effects resulting from tax reform     (4.8) 0.0
Incentive plan activity 2.5 2.0 7.8 9.4
Long-term incentive compensation expense 3.3 3.0 9.4 8.8
Restricted stock and restricted stock unit vesting, net of tax withholdings (0.3) (0.1) (3.6) (3.7)
Equity, end of period 369.7 255.0 369.7 255.0
Accounting Standards Update 2014-09 | SPX Corporation Shareholders' Equity        
Changes in Equity        
Cumulative effect of new accounting principle in period of adoption 4.0 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