Lease Accounting (Maturity of Lease Liability) (Details) $ in Millions	Mar. 31, 2020 USD ($)
Operating leases
2020	$ 11.3
2021	14.6
2022	13.8
2023	13.2
2024	12.8
After 2024	152.2
Total lease payments	217.9
less: interest	87.7
Present value of lease liabilities	130.2
Finance leases
2020	1.1
2021	1.0
2022	0.4
2023	0.0
2024	0.0
After 2024	0.0
Total lease payments	2.5
less: interest	0.2
Present value of lease liabilities	$ 2.3