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Leases (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
BuildingLease
Dec. 31, 2018
USD ($)
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 2047  
Sublease extension terms One building lease is subleased for terms extending through 2021  
Number of buildings subleased | BuildingLease 1  
Operating leases, weighted average remaining lease term 21 years 6 months  
Operating leases, weighted-average discount rate 3.82%  
Rent expense | $   $ 2.9