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Supplemental Disclosures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Supplemental Disclosures [Abstract]        
Effective tax rate 92.50% 39.50% 13.90%  
Tax Adjustments, Settlements, and Unusual Provisions       $ 3.7
Income tax refunds     $ 0.6 $ 0.7