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Basis of Presentation and Summary of Significant Accounting Policies - Narratives (Details) |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
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Nov. 01, 2022 USD ($) subsidiary | Mar. 31, 2022 USD ($) | Dec. 15, 2021 USD ($) | Aug. 02, 2021 USD ($) | Jun. 08, 2021 USD ($) | Apr. 19, 2021 USD ($) | Nov. 11, 2020 USD ($) | Sep. 02, 2020 USD ($) | Dec. 31, 2022 USD ($) project | Jul. 02, 2022 USD ($) | Apr. 02, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 02, 2021 USD ($) | Dec. 31, 2022 USD ($) project | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 23, 2022 USD ($) | Aug. 15, 2022 $ / shares | Oct. 01, 2021 USD ($) | Sep. 30, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (19,600,000) | $ 360,700,000 | $ (3,700,000) |  |  |  |
Number of subsidiaries divested (in subsidiaries) | subsidiary | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400,000 | 30,000,000.0 | 700,000 |  |  |  |
Foreign currency transaction net (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,100,000) | (900,000) | (600,000) |  |  |  |
Capitalized software, net of amortization |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  | $ 100,000 |  | 1,200,000 | 100,000 |  |  |  |  |
Capitalized software amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 1,300,000 | 2,500,000 |  |  |  |
Research and development expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,100,000 | 30,700,000 | 28,100,000 |  |  |  |
Depreciation expense, including amortization of capital leases |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,800,000 | 19,400,000 | 15,400,000 |  |  |  |
Interest capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400,000 | 30,000,000.0 | 700,000 |  |  |  |
Other operating (income) expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  | (74,900,000) | 4,100,000 | (9,000,000.0) |  |  |  |
ULC Robotics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  |  |  |  | 12,900,000 |  |  | 5,200,000 |  | 12,900,000 | 29,500,000 |  |  |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  |  |  |  | 12,900,000 |  |  | 5,200,000 |  | $ 12,900,000 | 29,500,000 |  |  |  |  |
The Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds received | $ 138,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating (income) expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,200,000 |  |  |  |  |
Buildings | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful lives of property, plant and equipment (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful lives of property, plant and equipment (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful lives of property, plant and equipment (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
SPX Transformer Solutions, Inc. | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Tower Lighting, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisition |  | $ 40,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sealite |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisition |  |  |  |  |  | $ 80,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise Control Systems Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisition |  |  |  | $ 39,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment |  |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | 0.0 |  |  | 1,500,000 | $ 8,200,000 | $ 0.0 | 1,500,000 |  |  |  |  |
Business combination, reduction in estimated liability |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 900,000 |  |  | 1,300,000 | 6,700,000 |  |  |  |  |
Contingent consideration, reversal of liability |  |  |  |  |  |  |  |  | $ 0.0 |  |  | 1,500,000 |  | 0.0 | 1,500,000 |  |  |  |  |
Cincinnati Fan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisition |  |  | $ 145,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, provisional information, initial accounting incomplete, adjustment, consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |
ULC Robotics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisition |  |  |  |  |  |  |  | $ 89,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  |  |  | 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment |  |  |  |  |  |  |  | 45,000,000.0 |  |  |  |  |  |  |  |  | $ 15,000,000.0 |  |  | $ 45,000,000.0
Contingent consideration |  |  |  |  |  |  |  | $ 24,300,000 |  |  |  |  | 24,300,000 |  |  |  |  |  |  |
Contingent consideration, reversal of liability |  |  |  |  |  |  |  |  |  |  |  | 24,300,000 | 24,300,000 |  | 24,300,000 |  |  |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 24,300,000 |  | 24,300,000 | 700,000 |  |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 24,300,000 |  | 24,300,000 | $ 700,000 |  |  |  |
Sensors & Software Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for acquisition |  |  |  |  |  |  | $ 15,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 700,000 |  |  |  |  | 1,300,000 |  |  | 1,300,000 |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  | 600,000 |  |  |  |  |
DBT | Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Large power projects part of dispute resolution | project |  |  |  |  |  |  |  |  | 2 |  |  |  |  | 2 |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  | 19,900,000 |  |  | (19,900,000) |  |  |  |  |
Transformer solutions | Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of all equity |  |  |  |  | $ 645,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transformer solutions | Discontinued operations, disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 620,600,000 |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 24,500,000 | $ 357,700,000 |  | $ 382,200,000 |  |  |  |  |
Payment for divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,900,000 |  |  |  |  |  |
Gain (loss) on disposition |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |
Canvas Holdco LLC | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition | (73,900,000) |  |  |  |  |  |  |  | $ (73,900,000) |  |  |  |  | $ (73,900,000) |  |  |  |  |  |
Legacy SPX |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |
Canvas Holdco LLC | The Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for divestitures | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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