Leases, Maturity of Lease liability (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	$ 2.6
2020	4.9
2021	4.2
2022	3.6
2023	3.4
2024	3.3
2025 and thereafter	18.6
Total minimum lease payments	40.6
Less: interest	(11.0)
Present value	29.6
Finance Lease Liabilities, Payments, Rolling Maturity [Abstract]
Remainder of 2019	0.8
2020	1.4
2021	1.2
2022	1.1
2023	1.1
2024	0.8
2025 and thereafter	1.6
Total minimum lease payments	8.0
Less: interest	(1.1)
Present value	$ 6.9