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Employee Benefit Plans Deferred Compensation Plan (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred Compensation Arrangement with Individuals, Recorded Liability $ 10.6 $ 11.2  
Deferred Compensation Arrangement with Individuals, Employer Contribution 1.1 1.6 1.4
Deferred Compensation Arrangement with Individuals, Increase or Decrease in Liability due to Change in Value $ 0.3 $ 1.1 $ 2.0