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EMPLOYEE RETIREMENT PLANS (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Weighted-average healthcare cost trend rate        
Weighted-average healthcare cost trend rate (as a percent)     6.64%  
Weighted-average healthcare cost trend rate in the year 2024 (as a percent)     4.50%  
Pension
       
Components of net periodic benefit cost (income):        
Interest cost $ 7.5 $ 1.8 $ 20.5 $ 5.4
Service cost 1.7   4.5  
Expected return on assets (9.8) (2.2) (27.0) (6.5)
Amortization of actuarial loss 0.5 0.4 1.6 1.3
Total net periodic benefit cost (income) (0.1)   (0.4) 0.2
Assumptions used to determine net periodic benefit (income) cost        
Discount rate (as a percent)     4.09% 5.00%
Expected return on plan assets (as a percent)     6.81% 8.25%
Rate of compensation increase (as a percent)     3.15%  
Contributions        
Significant contributions to the pension plan trusts 0 0 0 0
Estimated payments for the current fiscal year 2.1   2.1  
OPEB Benefits
       
Components of net periodic benefit cost (income):        
Interest cost 2.0   5.3  
Service cost 0.6   1.7  
Total net periodic benefit cost (income) 2.6   7.0  
Assumptions used to determine net periodic benefit (income) cost        
Discount rate (as a percent)     4.35%  
Rate of compensation increase (as a percent)     3.11%  
Contributions        
Estimated payments for the current fiscal year $ 6.8   $ 6.8