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INDEBTEDNESS - Senior Credit Facilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 27, 2026
Sep. 09, 2025
Line of Credit Facility [Line Items]    
Borrowings $ 497.1  
Foreign Credit Instrument Facilities    
Line of Credit Facility [Line Items]    
Letters of credit issued, amount outstanding 7.4  
Senior Credit Facility | Revolving loans    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under financing arrangement   $ 1,500.0
Senior Credit Facility | Current SPX Term Loan Facility    
Line of Credit Facility [Line Items]    
Face amount of debt   500.0
Revolving loans | Revolving loans    
Line of Credit Facility [Line Items]    
Amount of available borrowing capacity 1,457.3  
Borrowings 214.9  
Revolving loans | Revolving loans | United States    
Line of Credit Facility [Line Items]    
Borrowings 40.0  
Letter of Credit | Financial Letters Of Credit | Revolving loans    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under financing arrangement   200.0
Letter of Credit | Non - Financial Letters Of Credit | Revolving loans    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under financing arrangement   50.0
Letter of Credit | Non-U.S. Exposure | Revolving loans    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under financing arrangement   250.0
Letter of Credit | Bilateral Foreign Credit Instrument Facility | Revolving loans    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under financing arrangement   $ 25.0
Letter of Credit | Domestic Revolving Loan Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under financing arrangement 2.7  
Foreign credit instrument facility    
Line of Credit Facility [Line Items]    
Amount of available borrowing capacity $ 17.6  
Line of Credit    
Line of Credit Facility [Line Items]    
Weighted-average interest rate of senior credit facilities 5.00%