Significant Accounting Policies - Leases (Details)	12 Months Ended
	Dec. 31, 2019 approach
Leases
Operating leases, existence of option to extend	true
Finance leases, existence of option to extend	true
Maximum
Leases
Operating lease, term	5 years
Finance lease, term	5 years
Minimum
Leases
Number of options to renew for operating leases	1
Number of options to renew for finance leases	1