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Basis of Presentation and Summary of Significant Accounting Policies (Details) |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 07, 2024 USD ($) | Jun. 02, 2023 USD ($) | Apr. 03, 2023 USD ($) | Nov. 01, 2022 USD ($) subsidiary | Mar. 31, 2022 USD ($) | Jun. 08, 2021 | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 15, 2022 $ / shares
Asset acquired : |  |  |  |  |  |  |  |  |  |
Loss on disposition of discontinued operations, net of tax |  |  |  |  |  |  | $ (1,300,000) | $ (54,800,000) | $ (19,600,000) |
Number of subsidiaries divested (in subsidiaries) | subsidiary |  |  |  | 3 |  |  |  |  |  |
Business acquisition, net of cash acquired |  |  |  |  |  |  | 292,000,000.0 | 547,000,000.0 | 40,000,000.0 |
Foreign currency transaction net (losses) |  |  |  |  |  |  | 800,000 | (900,000) | (1,100,000) |
Capitalized software, net of amortization |  |  |  |  |  |  | 3,600,000 | 3,100,000 |  |
Capitalized software amortization expense |  |  |  |  |  |  | 400,000 | 100,000 | 100,000 |
Research and development expense |  |  |  |  |  |  | 45,900,000 | 43,200,000 | 39,100,000 |
Depreciation expense, including amortization of capital leases |  |  |  |  |  |  | 26,700,000 | 19,200,000 | 17,800,000 |
Interest capitalized |  |  |  |  |  |  | 0 | 0 | 0 |
Borrowings from life insurance policies |  |  |  |  |  |  | $ 41,200,000 |  |  |
Life insurance, corporate or bank owned, interest rate |  |  |  |  |  |  | 5.30% |  |  |
COLI assets |  |  |  |  |  |  | $ 36,200,000 | 76,700,000 |  |
Maximum | Buildings |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Useful lives of property, plant and equipment (in years) |  |  |  |  |  |  | 40 years |  |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Useful lives of property, plant and equipment (in years) |  |  |  |  |  |  | 15 years |  |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Useful lives of property, plant and equipment (in years) |  |  |  |  |  |  | 3 years |  |  |
The Subsidiaries |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  | $ 138,800,000 |  |  |  |  |  |
Discontinued operations, disposed of by sale | Transformer Solutions |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Payment for divestiture |  |  |  |  |  |  |  |  | 13,900,000 |
Loss on disposition of discontinued operations, net of tax |  |  |  |  |  |  |  |  | 200,000 |
Disposed of by Sale | Canvas Holdco LLC |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Loss on Asbestos Portfolio Sale |  |  |  | 73,900,000 |  |  |  |  |  |
Legacy SPX |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.01
Canvas Holdco LLC | The Subsidiaries |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Payment for divestitures |  |  |  | $ 8,000,000.0 |  |  |  |  |  |
SPX Transformer Solutions, Inc. | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 25.00% |  |  |  |
Ingénia Technologies Inc. |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Business acquisition, net of cash acquired | $ 292,000,000.0 |  |  |  |  |  |  |  |  |
Adjustment, consideration transferred |  |  |  |  |  |  | $ 2,100,000 |  |  |
Cash acquired from acquisition | $ 1,500,000 |  |  |  |  |  |  |  |  |
T. A. Morrison & Co. Inc. (TAMCO) |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Business acquisition, net of cash acquired |  |  | $ 125,500,000 |  |  |  |  |  |  |
Adjustment, consideration transferred |  |  |  |  |  |  |  | 200,000 |  |
Cash acquired from acquisition |  |  | $ 1,000,000.0 |  |  |  |  |  |  |
ASPEQ Parent Holdings, Inc. |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Business acquisition, net of cash acquired |  | $ 421,500,000 |  |  |  |  |  |  |  |
Adjustment, consideration transferred |  |  |  |  |  |  |  | $ 300,000 |  |
Cash acquired from acquisition |  | $ 900,000 |  |  |  |  |  |  |  |
International Tower Lighting, LLC |  |  |  |  |  |  |  |  |  |
Asset acquired : |  |  |  |  |  |  |  |  |  |
Business acquisition, net of cash acquired |  |  |  |  | $ 40,400,000 |  |  |  |  |
Adjustment, consideration transferred |  |  |  |  |  |  |  |  | $ 1,400,000 |
Cash acquired from acquisition |  |  |  |  | $ 1,100,000 |  |  |  |  |

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