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Retirement and Share-based Compensation Plans (Deferred Compensation Arrangements) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred Compensation Plans, Certain Officers, Directors and Consultants    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Shares reserved for future issuance 4,500 335,875
Deferred Compensation Plans, Officer Rabbi Trust    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Shares reserved for future issuance 27,661 30,532
Deferred compensation liability $ 0.8 $ 1.3