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EMPLOYEE BENEFIT PLANS (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Weighted average assumptions used      
Expected return on assets during next fiscal year 8.00%    
Equity securities:
     
Target asset allocations      
Target asset allocations (as a percent) 70.00%    
Fixed income securities:
     
Target asset allocations      
Target asset allocations (as a percent) 30.00%    
Pension Benefits | Benefit obligations
     
Weighted average assumptions used      
Discount rate 4.92% 4.07%  
Rate of compensation increase 4.25% 4.26%  
Pension Benefits | Net periodic benefit costs
     
Weighted average assumptions used      
Discount rate 4.07% 5.10% 5.80%
Expected return on plan assets 8.00% 8.25% 8.25%
Rate of compensation increase 4.26% 4.26% 4.28%
Other Benefits
     
Effects of a one-percentage-point change in assumed health care cost trend rates      
Effect of one-percentage-point increase on total of service and interest cost components of net periodic health care benefit cost $ 5.0    
Effect of one-percentage-point decrease on total of service and interest cost components of net periodic health care benefit cost (3.9)    
Effect of one-percentage-point increase on the health care component of the accumulated benefit obligation 51.2    
Effect of one-percentage-point decrease on the health care component of the accumulated benefit obligation $ (40.5)    
Other Benefits | Benefit obligations
     
Weighted average assumptions used      
Discount rate 4.98% 4.01%  
Assumed medical cost trend rate (as a percent) 6.50% 7.00%  
Ultimate trend rate (as a percent) 5.00% 5.00%  
Year ultimate trend rate is reached 2019 2019  
Assumed dental cost trend rate (as a percent) 5.00% 5.00%  
Other Benefits | Net periodic benefit costs
     
Weighted average assumptions used      
Assumed dental cost trend rate (as a percent) 5.00% 5.00% 5.00%
Discount rate 4.01% 5.04% 5.80%
Expected return on plan assets 8.00% 8.25% 8.25%
Other Benefits | Under age 65 | Net periodic benefit costs
     
Weighted average assumptions used      
Assumed medical cost trend rate (as a percent) 7.00% 7.00% 7.50%
Ultimate trend rate (as a percent) 5.00% 5.00% 5.00%
Year ultimate trend rate is reached 2019 2016 2016
Other Benefits | Over age 65 | Net periodic benefit costs
     
Weighted average assumptions used      
Assumed medical cost trend rate (as a percent) 7.00% 7.50% 8.00%
Ultimate trend rate (as a percent) 5.00% 5.00% 5.50%
Year ultimate trend rate is reached 2019 2016 2016