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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

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