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INCOME TAXES (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of federal income taxes to the provision for income taxes reported in the income statement (as a percent)      
Statutory federal income tax rate (as a percent) 35.00% 35.00% 35.00%
State income tax rate, net (as a percent) 3.90% 4.80% 5.30%
Federal tax credits (as a percent) (0.10%) (1.70%) (2.00%)
Benefits and compensation (as a percent) (0.70%) (2.10%) (2.30%)
Other differences, net (as a percent) (0.50%) (2.20%) 0.70%
Effective income tax rate (as a percent) 37.60% 33.80% 36.70%
Reconciliation of federal income taxes to the provision for income taxes reported in the income statement      
Statutory federal income tax $ 196.3 $ 155.4 $ 127.2
State income taxes, net 21.8 21.1 19.1
Federal tax credits (0.5) (7.6) (7.1)
Benefits and compensation (4.2) (9.4) (8.4)
Other differences, net (2.6) (9.7) 2.5
Effective income tax 210.8 149.8 133.3
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Balance at the beginning of the period 11.3 22.4 30.4
Increase related to tax positions taken in prior years 2.2 0.9 3.1
Decrease related to tax positions taken in prior years (8.7) (6.7) (1.6)
Increase related to tax positions taken in current year 0.3 0.6 0.9
Decrease related to settlements (1.5) (5.7) (9.4)
Decrease related to lapse of statutes 0 (0.2) (1.0)
Balance at the end of the period 3.6 11.3 22.4
Unrecognized tax benefits, additional disclosures      
Accrued interest related to unrecognized tax benefits 0.8 2.5  
Accrued penalties related to unrecognized tax benefits 0.4 2.0  
Unrecognized tax benefits related to continuing operations that could affect our effective tax rate, if recognized 1.9    
Unrecognized tax benefits related to discontinued operations that could affect our provision for income taxes, if recognized 0.5    
Decrease in liability for unrecognized tax benefits related to effective settlement and remeasurement of uncertain tax positions 6.5    
Reasonable possibility of decrease in unrecognized tax benefits with the next 12 months due to settlement of open examinations $ 0.9