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Leases (Narrative) (Details)
 9 Months Ended
Sep. 30, 2021
BuildingLease
Leases [Abstract]  
Operating leases term description The Company is obligated under a number of non-cancellable operating lease agreements for land, buildings and equipment with terms, including renewal options reasonably certain to be exercised, extending through 2061
Sublease extension terms One building lease was subleased in 2021 for terms that extended through June 30, 2021.
Number of buildings subleased 1
Operating leases, weighted average remaining lease term 24 years
Operating leases, weighted-average discount rate 3.70%