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CONTINGENT LIABILITIES AND OTHER MATTERS (Details 3) ZAR in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jul. 06, 2016 USD ($)	Jul. 06, 2016 ZAR
Noncontrolling Interest [Line Items]
Adjustment related to redeemable noncontrolling interest	$ 18.1	$ 0.0	$ 18.1	$ 0.0
SPX Technologies | BEE Partner | South Africa | Subsequent Event
Noncontrolling Interest [Line Items]
Amount due from BEE Partner under promissory note					$ 2.1	ZAR 30.3
SPX Technologies | BEE Partner | South Africa | Put Option
Noncontrolling Interest [Line Items]
Non-controlling interest percentage	25.10%		25.10%
Amount reclassified from noncontrolling interests to paid in capital			$ 38.7
Adjustment related to redeemable noncontrolling interest	$ 18.1		18.1
SPX Technologies | BEE Partner | South Africa | Put Option | Accrued Expenses
Noncontrolling Interest [Line Items]
Net redemption value	$ 17.3		$ 17.3
SPX Technologies | BEE Partner | South Africa | Put Option | Subsequent Event
Noncontrolling Interest [Line Items]
Amount entitled for Put Option exercise					$ 19.4	ZAR 287.3

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