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Income Taxes Quarterly (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Tax (Details) [Abstract]        
Income tax expense $ 34.3 $ 22.4 $ 69.4 $ 35.6
Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy       5.3
Effective Income Tax Rate Continuing Operations 34.20% 37.00% 35.80% 38.00%
Income Tax Reconciliation Other Adjustments     2.7  
Income Tax Reconciliation Prior Year Income Taxes       $ 3.7