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INDEBTEDNESS - Senior Credit Facilities (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 21, 2023
USD ($)
drawing
Jun. 30, 2023
USD ($)
Aug. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
Oct. 01, 2022
USD ($)
Sep. 30, 2023
USD ($)
Oct. 01, 2022
USD ($)
Line of Credit Facility [Line Items]              
Number of drawings | drawing 3            
Borrowings           $ 932,500,000  
Loss on amendment/refinancing of senior credit agreement       $ 0 $ 1,100,000 $ 0 $ 1,100,000
Senior Credit Facilities              
Line of Credit Facility [Line Items]              
Loss on extinguishment of debt     $ 1,100,000        
Loss on amendment/refinancing of senior credit agreement     700,000        
Unamortized debt issuance costs     400,000        
Fees paid     1,500,000        
Incremental Term loans | Term loan | Fed Funds Effective Rate Overnight Index Swap Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent) 0.50%            
Incremental Term loans | Term loan | Term SOFR Loans              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (as a percent) 1.00%            
Basis spread on variable rate 0.10%            
Incremental Term loans | Term loan | Secured Overnight Financing Rate (SOFR), Period One              
Line of Credit Facility [Line Items]              
Duration of interest period 1 month            
Incremental Term loans | Term loan | Secured Overnight Financing Rate (SOFR), Period Two              
Line of Credit Facility [Line Items]              
Duration of interest period 3 months            
Incremental Term loans | Term loan | Secured Overnight Financing Rate (SOFR), Period Three              
Line of Credit Facility [Line Items]              
Duration of interest period 6 months            
Secured Debt | Senior Credit Facilities              
Line of Credit Facility [Line Items]              
Face amount of debt $ 300,000,000.0            
Borrowings   $ 300,000,000.0          
Line of Credit              
Line of Credit Facility [Line Items]              
Weighted-average interest rate of senior credit facilities (as a percent)       7.00%   7.00%  
Line of Credit | Incremental Term loans              
Line of Credit Facility [Line Items]              
Percentage of capital stock of domestic subsidiaries 100.00%            
Percentage of capital stock of material first tier foreign subsidiaries 65.00%            
Percentage of non-voting capital stock 100.00%            
Revolving loans | Senior Credit Facilities              
Line of Credit Facility [Line Items]              
Fees paid     1,200,000        
Revolving loans | Current Revolving SPX Facilities              
Line of Credit Facility [Line Items]              
Borrowings           $ 551,300,000  
Amount of available borrowing capacity       $ 392,900,000   392,900,000  
Letters of credit issued, amount outstanding       10,800,000   10,800,000  
Revolving loans | Current Revolving SPX Facilities | UNITED STATES              
Line of Credit Facility [Line Items]              
Borrowings           96,300,000  
Foreign credit instrument facility              
Line of Credit Facility [Line Items]              
Amount of available borrowing capacity       9,700,000   9,700,000  
Letters of credit issued, amount outstanding       $ 15,300,000   $ 15,300,000  
Term loan | Senior Credit Facilities              
Line of Credit Facility [Line Items]              
Fees paid     $ 300,000