Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Lease payments, leases not yet commenced	$ 42.3	$ 34.7
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	33 years