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Acquisitions and Discontinued Operations - Pre-tax Income (Loss) and After-tax Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
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Apr. 03, 2021 | Mar. 28, 2020
Business Acquisition [Line Items] |  |
Income from discontinued operations, net of tax | $ (0.8) | $ 0.0
Discontinued Operations | SPX Heat Transfer Business |  |
Business Acquisition [Line Items] |  |
Revenues |  | 1.9
Cost of product sold |  | 1.5
Income before income tax |  | 0.4
Income tax provision |  | 0.0
Income from discontinued operations, net of tax |  | $ 0.4
Discontinued Operations, Disposed of by Sale |  |
Business Acquisition [Line Items] |  |
Income from discontinued operations, net of tax | $ (0.8) |

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