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Commitments, Contingent Liabilities and Other Matters - Noncontrolling Interest in South African Subsidiary (Details) R in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 ZAR (R)	Jul. 06, 2016 ZAR (R)
Loss Contingencies [Line Items]
Adjustment related to redeemable noncontrolling interest	$ 0.0	$ 0.0	$ 18.1
SPX Technologies | BEE Partner | South Africa
Loss Contingencies [Line Items]
Amount due from BEE Partner under promissory note | R					R 30.3
SPX Technologies | BEE Partner | Put Option | South Africa
Loss Contingencies [Line Items]
Amount entitled for Put Option exercise | R					R 287.3
Net redemption value	$ 17.7	$ 20.9		R 257.0
Amount reclassified from non-controlling interest to paid in capital			38.7
Adjustment related to redeemable noncontrolling interest			$ 18.1
DBT Technologies | SPX Technologies | BEE Partner | Put Option | South Africa
Loss Contingencies [Line Items]
Noncontrolling interest percentage	25.10%			25.10%

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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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