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EMPLOYEE BENEFIT PLANS (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee benefit plans      
Non-current liabilities $ (108.0) $ (113.0)  
Pension Benefits
      
Employee benefit plans      
Non-current liabilities (60.9) (66.6)  
Total (60.9) (66.6)  
Net loss (gain) (net of taxes) 55.8 56.1  
Prior service cost (net of taxes) (13.4) (14.8)  
Total 42.4 41.3  
Projected benefit obligation 210.1 192.6 189.8
Fair value of plan assets 149.2 126.0 137.9
Estimated prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2013 2.3    
Estimated net loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2013 6.8    
Qualified Plans
      
Employee benefit plans      
Projected benefit obligation 210.1 192.6  
Accumulated benefit obligation 209.6 191.9  
Fair value of plan assets 149.2 126.0  
Other Post-retirement Benefits
      
Employee benefit plans      
Current liabilities (2.1) (2.1)  
Non-current liabilities (47.1) (46.4)  
Total (49.2) (48.5)  
Net loss (gain) (net of taxes) 0.7 0.6  
Prior service cost (net of taxes) 0.1 0.1  
Total 0.8 0.7  
Projected benefit obligation 49.2 48.5 51.8
Estimated net loss and prior service cost that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2013 $ 0.3    
Amortization period of unrecognized gains and losses 5 years