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EMPLOYEE RETIREMENT PLANS (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amounts recognized in the balance sheets consist of:      
Noncurrent asset $ 26.9    
Noncurrent liability (129.8) (52.3)  
Changes in plan assets and benefit obligations which were recognized in other comprehensive income (loss)      
Total recognized in other comprehensive income (loss) 173.4 (13.4) (20.6)
Pension Benefits
     
Funded status, end of year:      
Fair value of plan assets 659.4 115.8 107.7
Benefit obligations 673.4 168.5 147.3
Unfunded status (14.0) (52.7)  
Amounts recognized in the balance sheets consist of:      
Noncurrent asset 26.9    
Current liability (1.3) (0.4)  
Noncurrent liability (39.6) (52.3)  
Amount recognized, end of year (14.0) (52.7)  
Gross amounts recognized in accumulated other comprehensive income (loss) consist of:      
Net actuarial gain (loss) 11.4 (77.5)  
Prior service credit (cost) (0.1) (0.1)  
Amount recognized, end of year 11.3 (77.6)  
Projected Benefit Obligation in Excess of Plan Assets      
Projected benefit obligation, end or year 430.5 168.5  
Fair value of plan assets, end of year 398.6 115.8  
Accumulated Benefit Obligation in Excess of Plan Assets      
Accumulated benefit obligation, end of year 417.6 168.5  
Fair value of plan assets, end of year 378.9 115.8  
Changes in plan assets and benefit obligations which were recognized in other comprehensive income (loss)      
Current year actuarial gain (loss) 102.2 (15.0) (22.1)
Amortization of actuarial loss (gain) (13.3) 1.6 1.5
Total recognized in other comprehensive income (loss) 88.9 (13.4) (20.6)
Total recognized in net periodic benefit cost and other comprehensive income (loss) 106.2 (13.5) (20.0)
Estimated amount that will be amortized from accumulated other comprehensive income into net periodic benefit cost in the next fiscal year      
Actuarial gain (loss) 0.4    
Total 0.4    
OPEB Benefits
     
Funded status, end of year:      
Benefit obligations 97.9    
Unfunded status (97.9)    
Amounts recognized in the balance sheets consist of:      
Current liability (7.7)    
Noncurrent liability (90.2)    
Amount recognized, end of year (97.9)    
Gross amounts recognized in accumulated other comprehensive income (loss) consist of:      
Net actuarial gain (loss) 4.2    
Prior service credit (cost) 80.4    
Amount recognized, end of year 84.6    
Changes in plan assets and benefit obligations which were recognized in other comprehensive income (loss)      
Current year actuarial gain (loss) 4.2    
Current year prior service credit 82.6    
Amortization of prior service credit (2.3)    
Total recognized in other comprehensive income (loss) 84.5    
Total recognized in net periodic benefit cost and other comprehensive income (loss) 78.5    
Estimated amount that will be amortized from accumulated other comprehensive income into net periodic benefit cost in the next fiscal year      
Actuarial gain (loss) (0.1)    
Prior service credit (cost) 9.2    
Total $ 9.1