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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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