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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reconciliation of provision for income taxes computed at federal statutory rates to the effective rates [Abstract]        
Consolidated tax provision at federal statutory rate (in hundredths) 35.00% 35.00% 35.00% 35.00%
State income tax provisions, net of federal income tax benefit (in hundredths) 9.20% 3.10% (8.20%) 2.80%
Noncontrolling interest (in hundredths) (0.60%) (1.40%) 0.00% (1.10%)
Tax reserve adjustment (in hundredths) 7.70% (2.10%) (15.40%) (0.20%)
Changes in certain deferred tax balances (in hundredths) (10.60%) 0.00% 22.60% 0.00%
IRS audit adjustments (in hundredths) (9.00%) 0.00% 19.30% 0.00%
All other, net (in hundredths) 1.10% 0.20% 0.80% 0.20%
Effective tax rate (in hundredths) 32.80% 34.80% 54.10% 36.70%
Settlement of 2010 IRS audit $ 5.2   $ 5.2  
Adjustment of deferred tax balances 6.0   6.0  
Reversal of reserves for uncertain tax postions 4.4   4.4  
Effect of expiration of statute of limitations during next twelve months $ 2.4   $ 2.4