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ACQUISITIONS AND DISCONTINUED OPERATIONS - Pre-tax Income (Loss) and After-tax Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Costs and expenses:        
Income from discontinued operations, net of tax     $ 54.6 $ 25.1
Discontinued Operations        
Costs and expenses:        
Income tax (provision) benefit $ 33.0   33.0  
Discontinued Operations | Transformer Solutions Business        
Acquisitions and Discontinued Operations [Line Items]        
Revenues 108.5 $ 113.9 219.1 224.5
Costs and expenses:        
Cost of product sold 87.3 88.5 176.7 175.1
Selling, general and administrative 8.6 8.2 18.1 16.0
Other income, net 0.2 0.4 0.0 0.7
Income (loss) before income tax 12.8 17.6 24.3 34.1
Income tax (provision) benefit 29.9 (4.1) 27.0 (7.8)
Income from discontinued operations, net of tax 42.7 13.5 51.3 26.3
Excess tax basis 28.6   28.6  
Previously unrecognized net operating losses $ 4.4   $ 4.4  
Discontinued Operations | SPX Heat Transfer Business        
Acquisitions and Discontinued Operations [Line Items]        
Revenues   1.3   3.2
Costs and expenses:        
Cost of product sold   1.0   2.5
Selling, general and administrative   0.2   0.2
Special charges, net   0.4   0.4
Income (loss) before income tax   (0.3)   0.1
Income tax (provision) benefit   0.0   0.0
Income from discontinued operations, net of tax   $ (0.3)   $ 0.1