Lease Accounting (Leases Under Topic 840) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating leases
2019	$ 13.7
2020	13.3
2021	12.5
2022	11.7
2023	11.1
After 2023	122.6
Total lease payments	184.9
Capital leases
2019	1.5
2020	1.1
2021	0.6
2022	0.1
2023	0.0
After 2023	0.0
Total lease payments	3.3
less: interest	0.2
Present value of minimum payments	$ 3.1