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SHORT-TERM DEBT (Details)
1 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Short-term Debt [Line Items]                    
Short-term debt, outstanding         $ 55,603,000       $ 386,140,000  
Line of credit [Member]                    
Short-term Debt [Line Items]                    
Lines of credit         $ 55,603,000       $ 16,392,000  
Maximum month-end balance during the year   $ 55,621,000 $ 24,722,000              
Weighted average interest rate during the year   2.41% 4.04%              
Weighted average interest rate at December 31       2.01% 2.01% 2.01%   5.13% 5.13% 5.13%
Commercial Paper [Member]                    
Short-term Debt [Line Items]                    
Maximum month-end balance during the year   $ 454,696,000 $ 629,712,000              
Weighted average interest rate during the year   0.83% 0.50%              
Weighted average interest rate at December 31       0.00% 0.00% 0.00%   0.69% 0.69% 0.69%
Commercial paper         $ 0       $ 369,748,000  
Short-term debt, outstanding         0          
Letter of Credit [Member]                    
Short-term Debt [Line Items]                    
Letters of credit outstanding         33,000,000       30,000,000  
Letters of credit outstanding to facilitate purchase of products         1,000,000       5,000,000  
Unsecured Revolving Line Of Credit [Member] | Domestic Line of Credit [Member]                    
Short-term Debt [Line Items]                    
Line of credit, maximum borrowing capacity             $ 900,000,000      
Line of credit, outstanding                 0  
Commitment fee percentage     0.07%              
5-Year Unsecured Revolving Line Of Credit [Member] | Domestic Line of Credit [Member]                    
Short-term Debt [Line Items]                    
Line of credit, maximum borrowing capacity $ 750,000,000                  
Debt, term 5 years                  
Line of credit, higher borrowing capacity option $ 1,100,000,000                  
Line of credit, outstanding         $ 0          
Commitment fee percentage   0.06%                
British Pound Revolving Credit Facility [Member] | Foreign Line of Credit [Member]                    
Short-term Debt [Line Items]                    
Commitment fee percentage   0.26%                
Basis points   0.75%                
Stated interest rate       1.22% 1.22% 1.22%        
Short-term debt, outstanding | £       £ 20,000,000       £ 0    
Euro Revolving Credit Facility [Member] | Foreign Line of Credit [Member]                    
Short-term Debt [Line Items]                    
Commitment fee percentage   0.12%                
Basis points   0.35%                
Stated interest rate       0.35% 0.35% 0.35%        
Short-term debt, outstanding | €           € 12,500,000       € 0
Uncommitted Line Of Credit [Member] | Line of credit [Member]                    
Short-term Debt [Line Items]                    
Short-term debt, outstanding         $ 71,000,000       $ 88,000,000