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BASIS OF PRESENTATION (Details) € in Millions, $ in Millions			3 Months Ended					9 Months Ended		12 Months Ended
	Jun. 07, 2018 USD ($)	Mar. 01, 2018 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Apr. 01, 2017 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 07, 2018 USD ($)	Mar. 01, 2018 USD ($)	Jul. 31, 2018 EUR (€)	May 31, 2018 EUR (€)	Apr. 30, 2018 EUR (€)
Discontinued Operations
Business acquisition, net of cash acquired								$ 182.6	$ 0.0
Gain (loss) on disposition of discontinued operations, net of tax			$ (0.2)		$ 0.3			$ 3.1	6.7
Length of second and third quarter								91 days
SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Disposal group, wind down charges				$ 2.0
Proceeds from sale of intangible assets				4.8
Gain (loss) on disposition of intangible assets				0.1
Balcke Durr Business
Discontinued Operations
Gain (loss) on disposition of discontinued operations, net of tax				3.8		$ 3.8
Balcke Durr Business | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Increase (reduction) of gain (loss)			(0.2)		0.3			$ 0.0	(0.1)
Balcke Durr Business | Discontinued Operations, Disposed of by Sale | Buyer
Discontinued Operations
Increase (reduction) of gain (loss)					(0.4)	$ (0.4)	$ (7.2)
Additional income tax benefit recorded from sale							8.4
Adjustments to liabilities retained in connection with the sale							$ 1.2
Disposal group, including discontinued operation, consideration | €												€ 1.0	€ 2.0	€ 3.0
Cues, Inc.
Discontinued Operations
Business acquisition, net of cash acquired	$ 166.2
Cash acquired	$ 20.6
Revenues			362.5		$ 369.9			$ 1,127.7	$ 1,102.2	$ 84.0
Schonstedt
Discontinued Operations
Business acquisition, net of cash acquired		$ 16.4
Cash acquired		$ 0.3
Revenues											$ 9.0
Cost of Sales | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Disposal Group, inventory write-down				0.9
Special Charges, Net | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Discontinued Operations
Disposal Group, asset impairment				0.6
Disposal Group, severance costs			$ 0.8	$ 0.5

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