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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

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