Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Lease not yet commenced, expense	$ 34.7
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use asset		$ 225.0
Lease liabilities		$ 225.0
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	34 years