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Employee Benefit Plans Deferred Compensation Plan (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Deferred compensation arrangement with individual, recorded liability $ 5.9 $ 11.3
Deferred compensation arrangement with individual, distributions paid 5.6  
Increase (decrease) in deferred compensation $ (5.6)