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BASIS OF PRESENTATION - Narrative (Details) - USD ($) $ in Millions				3 Months Ended			6 Months Ended
	Feb. 01, 2019	Jun. 07, 2018	Mar. 01, 2018	Jun. 29, 2019	Mar. 30, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Jul. 31, 2018	May 31, 2018	Apr. 30, 2018
Discontinued Operations
Gain on settlement				$ (0.2)		$ 3.3	$ (1.6)	$ 3.3
Business acquisition, net of cash acquired							$ 77.2	$ 182.6
Length of second and third quarter							91 days
SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Wind-down charges						2.0
Proceeds from sale of intangible assets						5.5
Gain on disposition of intangible assets						0.1
Balcke Durr Business
Discontinued Operations
Gain on settlement						3.8
Sabik Marine
Discontinued Operations
Business acquisition, net of cash acquired	$ 77.2
Cash acquired	$ 0.6
Cues, Inc.
Discontinued Operations
Business acquisition, net of cash acquired		$ 164.4
Cash acquired		$ 20.6
Schonstedt
Discontinued Operations
Business acquisition, net of cash acquired			$ 16.4
Cash acquired			$ 0.3
Building | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Proceeds from sale of manufacturing facility					$ 5.5
Gain (loss) on disposition of manufacturing facility					$ 0.3
Subsidiary of mutares AG (the Buyer) | Balcke Durr Business | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Net payment from Buyer									$ 1.0	$ 2.0	$ 3.0
Cost of Sales | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Write-down of inventories						0.9
Special Charges, Net | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Impairment of machinery and equipment						0.6
Severance costs						$ 0.5

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