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Basis of Presentation and Summary of Significant Accounting Policies - Narratives (Details)
 3 Months Ended 12 Months Ended
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