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INDEBTEDNESS (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt    
Balance at the beginning of the period $ 356,800,000  
Borrowings 12,700,000  
Repayments (13,100,000)  
Other 200,000  
Balance at the end of the period 356,600,000  
Less: short-term debt 6,800,000 $ 7,000,000
Less: current maturities of long-term debt 4,900,000 500,000
Total long-term debt 344,900,000 349,300,000
Trade receivables financing arrangement    
Debt    
Balance at the beginning of the period 0  
Borrowings 0  
Repayments 0  
Other 0  
Balance at the end of the period 0  
Maximum borrowing capacity 50,000,000.0  
Amount of available borrowing capacity 30,000,000  
Other indebtedness    
Debt    
Balance at the beginning of the period 9,100,000  
Borrowings 12,700,000  
Repayments (13,100,000)  
Other 100,000  
Balance at the end of the period 8,800,000  
Purchase card programs 2,500,000 2,800,000
Capital lease obligations 2,000,000 2,100,000
Revolving loans | Current Revolving SPX Facilities    
Debt    
Balance at the beginning of the period 0  
Borrowings 0  
Repayments 0  
Other 0  
Balance at the end of the period 0  
Term loans | Current SPX Term Loan Facilities    
Debt    
Balance at the beginning of the period 347,700,000  
Borrowings 0  
Repayments 0  
Other 100,000  
Balance at the end of the period $ 347,800,000  
Initial principal amount of the term loan to be repaid annually in quarterly installments (as a percent) 1.25%  
Original loan balance $ 350,000,000.0  
Debt issuance costs 2,200,000 2,300,000
Foreign credit instrument facility | Other indebtedness | South Africa and China    
Debt    
Borrowings under line of credit $ 4,300,000 $ 4,100,000