Lease Accounting (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) contract site	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating leases right of use assets	$ 124.2
Present value of lease liabilities	$ 125.3
Number of leases with restrictive covenants | site	102
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Lease renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	20 years
Lease renewal term	20 years
Land
Lessee, Lease, Description [Line Items]
Number of leases | contract	215
Terminal
Lessee, Lease, Description [Line Items]
Number of leases | contract	1
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating leases right of use assets		$ 110.4
Present value of lease liabilities		$ 110.7