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Employee Benefit Plans - Defined Benefit Pension Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 17, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Employee benefit plans        
Common stock held by defined benefit pension plans (in shares)   0 0  
SPX Postretirement Plans        
Employee benefit plans        
Defined benefit plan, benefit obligation, loss on settlement     $ 0.7  
Transfer to insurance carrier for cash consideration $ 10.0      
Actuarial (gains) losses     $ 0.4  
United States        
Employee benefit plans        
Discount rate   5.54% 3.99% 2.35%
United States | Pension plans        
Employee benefit plans        
Accumulated benefit obligation   $ 245.7 $ 246.9  
Actuarial (gains) losses   $ (7.6) $ 66.4