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ACQUISITIONS AND DISCONTINUED OPERATIONS - Pre-tax Income (Loss) and After-tax Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Costs and expenses:        
Income (loss) from discontinued operations, net of tax     $ 378.0 $ 32.3
Discontinued Operations | Transformer Solutions Business        
Acquisitions and Discontinued Operations [Line Items]        
Revenues $ 94.4 $ 95.1 313.5 319.6
Costs and expenses:        
Cost of product sold 81.3 78.4 258.0 253.5
Selling, general and administrative 10.3 7.0 28.4 23.0
Other income, net 0.0 0.2 0.0 0.9
Income (loss) before income tax 2.8 9.9 27.1 44.0
Income tax provision (33.8) (2.7) (6.8) (10.5)
Income (loss) from discontinued operations, net of tax $ (31.0) 7.2 $ 20.3 33.5
Discontinued Operations | SPX Heat Transfer Business        
Acquisitions and Discontinued Operations [Line Items]        
Revenues   0.0   3.2
Costs and expenses:        
Cost of product sold   0.1   2.6
Selling, general and administrative   (0.1)   0.1
Special charges, net   0.1   0.5
Income (loss) before income tax   (0.1)   0.0
Income tax provision   0.0   0.0
Income (loss) from discontinued operations, net of tax   $ (0.1)   $ 0.0