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Retirement and Share-based Compensation Plans (Deferred Compensation Arrangements) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Compensation Plans, Certain Officers, Directors and Consultants    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Shares reserved for future issuance 4,500 4,500
Deferred Compensation Plans, Officer Rabbi Trust    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Shares reserved for future issuance 26,011 27,661
Deferred compensation liability $ 1.0 $ 0.8