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Supplemental Disclosures (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
Supplemental Disclosures [Abstract]        
Effective tax rate 25.50% 23.50% 45.50% 34.10%
Payment of income tax expense due to settlement     $ 61.0 $ 10.6
Cash paid for interest and income taxes, net of income tax refunds     $ 4.1 $ 7.3