Leases Supplemental lease information (Details)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining operating leases term	13 years 9 months 18 days	15 years
Weighted-average remaining finance leases term	9 years 7 months 6 days	6 years 10 months 24 days
Weighted-average operating leases discount rate	2.10%	2.70%
Weighted-average finance leases discount rate	7.10%	11.50%