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Income Tax Expense Level 4 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
INCOME TAX EXPENSE [Abstract]        
Effective Income Tax Rate, Continuing Operations 24.30% 26.70% 24.60% 20.50%
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   $ 10.4    
Tax Adjustments, Settlements, and Unusual Provisions   $ 3.7