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Basis of Presentation and Summary of Significant Accounting Policies (Detail) - USD ($) $ in Millions					3 Months Ended		12 Months Ended
	Nov. 12, 2019	Jul. 03, 2019	Feb. 01, 2019	Jun. 07, 2018	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition and other investments, net of cash acquired							$ 147.1	$ 180.8	$ 0.0
Foreign Currency Translation and Transactions
Foreign currency transaction net losses							$ 1.5	0.3	$ 3.3
SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Wind-down charges recorded								3.5
Proceeds from sale of intangible assets								4.8
Gain on sale of intangible assets								0.1
SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations | Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of manufacturing facility						$ 5.5
Gain (loss) on disposition of manufacturing facility						0.3
Cost of Sales | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Wind-down charges related to inventories								0.9
Special Charges, Net | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Wind-down charges related to impairment of machinery and equipment								0.6
Wind-down charges related to severance costs								$ 2.0
Sabik Marine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition and other investments, net of cash acquired			$ 77.2
Cash acquired			$ 0.6
SGS Refrigeration Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash paid to acquire business		$ 10.0
Deferred payment		$ 1.5
Patterson-Kelley, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash paid to acquire business	$ 59.9
Schonstedt Instrument Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition and other investments, net of cash acquired						16.4
Cash acquired						$ 0.3
Cues, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition and other investments, net of cash acquired				$ 164.4	$ 164.4
Cash acquired				$ 20.6	$ 20.6

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