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Acquisitions and Discontinued Operations - Wind-Down of the Heat Transfer Business (Details) - Discontinued operations - SPX Heat Transfer Business - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 30, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Wind-down charges recorded |  | $ 3.5
Proceeds from sale of intangible assets |  | 4.8
Gain on sale of intangible assets |  | 0.1
Buildings |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from sale of manufacturing facility | $ 5.5 |
Gain (loss) on disposition of manufacturing facility | $ 0.3 |
Special Charges, Net |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Wind-down charges related to impairment of machinery and equipment |  | 0.6
Wind-down charges related to severance costs |  | 2.0
Cost of Sales |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Wind-down charges related to inventories |  | $ 0.9

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