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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income tax expense $ 0.9 $ 2.3 $ 4.8 $ 4.2
Effective income tax rate, continuing operations (12.90%) 9.30% 9.30% 3.80%
Net Tax Expense from Amendment of State Tax Returns due to Settlement of Federal Income Tax Audits     1.3  
Net Tax Benefit from Audit Settlements and Reversal of State DTL's       $ 2.8