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Basis of Presentation and Summary of Significant Accounting Policies (Detail) shares in Thousands, $ 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 ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Sep. 16, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss incurred	$ (58.6)	$ (22.3)	$ 9.0	$ (17.4)	$ 86.1	$ (1.9)	$ (4.0)	$ (13.0)	$ (89.3)	$ 67.2	$ 82.7
Retirement of treasury stock (in shares) | shares										0
Amount of retirement of treasury stock										$ 0.0
Foreign Currency Translation and Transactions
Foreign currency transaction net losses									$ 3.3	$ 2.4	8.6
Common Stock In Treasury
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Retirement of treasury stock (in shares) | shares										50,000
Amount of retirement of treasury stock										$ (2,948.1)
Paid-In Capital
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of retirement of treasury stock										1,285.4
Retained Earnings (Deficit)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of retirement of treasury stock										$ 1,662.2
Balcke Durr | Engineered Solutions segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss incurred											$ 39.6
SPX Flow, Inc | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pro rata distribution ratio of common stock received by shareholders as of record date												1

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