Leases (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lessee, lease termination period	1 year
Lessor, average remaining lease term	5 years
COVID-19 related rent deferrals	$ 2.4	$ 4.8
Minimum
Lessee, Lease, Description [Line Items]
Lessee, remaining lease term	1 year
Lessee, lease renewal term	2 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, remaining lease term	52 years
Lessee, lease renewal term	40 years