Lease Accounting (Maturity of Lease Liability) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Operating leases
2020	$ 8.0
2021	16.0
2022	15.1
2023	14.6
2024	14.0
After 2024	169.2
Total lease payments	236.9
less: interest	93.1
Present value of lease liabilities	143.8
Finance leases
2020	0.7
2021	1.1
2022	0.6
2023	0.1
2024	0.0
After 2024	0.0
Total lease payments	2.5
less: interest	0.1
Present value of lease liabilities	$ 2.4	$ 2.4