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Leases (Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate) (Details)
Dec. 31, 2020
Dec. 31, 2019
Weighted-average remaining lease term:    
Operating leases 7 years 7 years
Finance leases 15 years 14 years
Weighted-average discount rate:    
Operating leases 3.50% 4.10%
Finance leases 2.70% 2.90%