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Contingencies (Shareholder Class Action and Shareholder Derivative Lawsuits) (Details) - shareholder
 1 Months Ended 3 Months Ended
Jan. 25, 2021
Jan. 31, 2021
Oct. 31, 2020
Sep. 30, 2020
Aug. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]            
Loss Contingency, Number Of Shareholders Filing Derivative Lawsuits     1 1 2  
Loss contingency, number of shareholders filing class action lawsuits           2
Subsequent Event [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Number Of Shareholders Filing Derivative Lawsuits   1        
Loss contingency, number of shareholders filing class action lawsuits 16