Leases - Weighted-average remaining lease term and discount rate for the Company’s leases (Details)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating leases - Weighted average lease term	2 years 7 months 6 days	7 years 1 month 6 days
Operating leases - Weighted average discount rate (percent)	3.90%	4.10%
Finance leases - Weighted average lease term	4 years 7 months 6 days	4 years 1 month 6 days
Finance leases - Weighted average discount rate (percent)	3.60%	3.90%