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Commitments, Contingent Liabilities and Other Matters - Noncontrolling Interest in South African Subsidiary (Details) ZAR in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Apr. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2016 USD ($)	Jul. 02, 2016 USD ($)	Apr. 02, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 ZAR	Jul. 06, 2016 ZAR
Loss Contingencies [Line Items]
Adjustment related to redeemable noncontrolling interest	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 18.1	$ 0.0	$ 0.0	$ 18.1	$ 0.0
SPX Technologies | BEE Partner | South Africa
Loss Contingencies [Line Items]
Amount due from BEE Partner under promissory note | ZAR													ZAR 30.3
SPX Technologies | BEE Partner | Put Option | South Africa
Loss Contingencies [Line Items]
Noncontrolling interest percentage	25.10%								25.10%			25.10%
Amount entitled for Put Option exercise | ZAR													ZAR 287.3
Net redemption value	$ 20.9				$ 18.5				$ 20.9	18.5		ZAR 257.0
Amount reclassified from non-controlling interest to paid in capital										38.7
Adjustment related to redeemable noncontrolling interest			$ 18.1							$ 18.1

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Amount of decrease (increase) in additional paid in capital (APIC) for the increase in carrying amount of redeemable preferred stock.

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