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EMPLOYEE BENEFIT PLANS (Details 6) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Expected federal subsidies which will partially offset other postretirement benefits      
2014 $ (2.2)    
2015 (2.3)    
2016 (2.5)    
2017 (2.6)    
2018 (2.7)    
2019 through 2023 (15.8)    
Defined Contribution Benefit Plans      
Shares of the entity's common stock held under employee stock ownership plan (ESOP) 3.8    
Market value of shares of the entity's common stock held under employee stock ownership plan (ESOP) 206.4    
Total costs incurred for defined contribution benefit plans 36.4 19.1 17.0
Deferred compensation plans      
Percentage of director fees that can be deferred by nonemployee directors 100.00%    
Deferred compensation obligation classified as an equity instrument 24.8 23.9  
Deferred compensation obligation associated with deferrals that allow for distribution in cash 53.4 42.9  
Costs incurred under deferred compensation arrangement 6.5 3.1 2.1
Total costs of the entity's common stock held in the Rabbi Trust 23.0 17.7  
Pension Benefits
     
Employee Benefit Plans      
Expected contributions to the plans during the next fiscal year 72.3    
Expected payments, reflecting expected future service      
2014 125.1    
2015 123.3    
2016 126.1    
2017 129.3    
2018 125.9    
2019 through 2023 657.6    
Other Benefits
     
Employee Benefit Plans      
Expected contributions to the plans during the next fiscal year 11.9    
Expected payments, reflecting expected future service      
2014 30.0    
2015 32.5    
2016 35.0    
2017 37.5    
2018 39.9    
2019 through 2023 $ 234.1