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PENSION AND POST RETIREMENT PLANS (Details 6) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (net of tax)      
Amortization of unrecognized (loss) gain $ (4.7) $ (4.8) $ (3.9)
Prior service credit (18.7) 4.6 5.7
Amortization of prior service cost 1.3 1.4 (0.3)
Pension Benefits
      
Components of Net Periodic Benefit Cost      
Service cost 2.9 2.7 5.4
Interest cost 8.6 9.0 10.7
Expected return on plan assets (11.9) (10.7) (11.1)
Amortization of net loss (gain) 6.8 7.0 4.0
Amortization of prior service cost (2.3) (2.3) 0.1
Net periodic benefit cost 4.1 5.7 9.1
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (net of tax)      
Net loss (gain) (19.6) 4.0 23.8
Amortization of unrecognized (loss) gain (4.2) (4.2) (2.4)
Prior service credit     (15.1)
Amortization of prior service cost 1.4 1.4 (0.1)
Total recognized in other comprehensive income (22.4) 1.2 6.2
Total recognized in net periodic benefit cost and other comprehensive income (18.3) 6.9 15.3
Weighted Average Assumptions:      
Discount rate (as a percent) 4.90% 4.20% 4.80%
Expected return plan assets (as a percent) 8.30% 8.30% 8.30%
Rate of compensation increase (as a percent) 3.00% 3.00% 4.00%
Qualified Pension Plans and Post-retirement Plans      
Total obligation 197.5 210.1 192.6
Expense associated with plans 4.1 5.7 9.1
Amounts recognized in accumulated other comprehensive income for net loss, net of tax 32.0 55.8  
Amount recognized as prior service credit, net of tax (12.0) (13.4)  
Estimated net loss and prior service credit, net of tax, that will be recognized in net periodic pension cost 20.0 42.4  
Non-qualified Pension Plans
      
Components of Net Periodic Benefit Cost      
Net periodic benefit cost 0.6 0.3 0.8
Qualified Pension Plans and Post-retirement Plans      
Number of outside directors covered under the frozen non-qualified pension plan 2    
Total obligation 7.3 7.9  
Discount rate used to determine obligation (as a percent) 3.20%    
Expense associated with plans 0.6 0.3 0.8
Amounts recognized in accumulated other comprehensive income for net loss, net of tax 1.3    
Amount recognized as prior service credit, net of tax 0.8    
Estimated net loss and prior service credit, net of tax, that will be recognized in net periodic pension cost 0    
Other Post-retirement Benefits
      
Employee benefit plans      
Current liabilities 2.4 2.1  
Components of Net Periodic Benefit Cost      
Service cost 1.1 1.0 0.9
Interest cost 2.1 2.3 3.0
Amortization of net loss (gain) 0.3 0.6 1.9
Amortization of prior service cost   0.1 0.2
Net periodic benefit cost 3.5 4.0 6.0
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (net of tax)      
Net loss (gain) 1.2 (0.4) (2.5)
Amortization of unrecognized (loss) gain (0.2) (0.3) (1.0)
Amortization of prior service cost     (0.1)
Total recognized in other comprehensive income 1.0 (0.7) (3.6)
Total recognized in net periodic benefit cost and other comprehensive income 4.5 3.3 2.4
Weighted Average Assumptions:      
Discount rate (as a percent) 5.00% 4.30% 4.90%
Rate of compensation increase (as a percent) 3.00% 3.00% 4.00%
Initial health care cost trend rate (as a percent) 7.30% 8.00% 9.00%
Ultimate rate (as a percent) 4.50% 4.50% 5.00%
Effect of one percentage point change in the assumed health care cost trend rates      
Effect of one percentage point increase on total of service and interest cost components 0.6 0.6 0.6
Effect of one percentage point increase on post-retirement benefit obligation 7.1 6.5 6.6
Effect of one percentage point decrease on total of service and interest cost components (0.5) (0.4) (0.5)
Effect of one percentage point decrease on post-retirement benefit obligation (5.7) (5.2) (5.3)
Qualified Pension Plans and Post-retirement Plans      
Total obligation 52.1 49.2 48.5
Expense associated with plans 3.5 4.0 6.0
Amounts recognized in accumulated other comprehensive income for net loss, net of tax 1.7 0.7  
Amount recognized as prior service credit, net of tax   0.1  
Estimated net loss and prior service credit, net of tax, that will be recognized in net periodic pension cost 1.7 0.8  
Non-qualified pension benefits and postretirement benefits
      
Employee benefit plans      
Current liabilities $ 5.0