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Employee Benefit Plans Deferred Compensation Plan (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Deferred compensation distributions   $ 0.8 $ 1.1 $ 1.6
Deferred Compensation Arrangement with Individuals, Recorded Liability 11.3 11.3 10.6  
Increase (Decrease) in Deferred Compensation $ 1.3   $ 0.3 $ 1.1