Leases, Maturity of Lease liability (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	$ 3.7
2020	4.7
2021	4.1
2022	3.6
2023	3.4
2024	3.3
2025 and thereafter	18.7
Total minimum lease payments	41.5
Less: interest	(11.4)
Present value	30.1
Finance Lease Liabilities, Payments, Rolling Maturity [Abstract]
Remainder of 2019	1.2
2020	1.4
2021	1.2
2022	1.1
2023	1.0
2024	0.6
2025 and thereafter	1.2
Total minimum lease payments	7.7
Less: interest	(1.0)
Present value	$ 6.7