Leases, Maturity of Lease liability (Details) $ in Millions	Mar. 31, 2020 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2020	$ 4.7
Operating Lease, Liability, Payments, Due Year One	5.5
Lessee, Operating Lease, Liability, Payments, Due Year Two	4.7
Lessee, Operating Lease, Liability, Payments, Due Year Three	4.3
Lessee, Operating Lease, Liability, Payments, Due Year Four	4.1
Lessee, Operating Lease, Liability, Payments, Due Year Five	2.2
2026 and thereafter	16.9
Total minimum lease payments	42.4
Less: interest	(10.1)
Present value	32.3
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Remainder of 2020	1.2
Finance Lease, Liability, Payments, Due Year One	1.4
Finance Lease, Liability, Payments, Due Year Two	1.3
Finance Lease, Liability, Payments, Due Year Three	1.2
Finance Lease, Liability, Payments, Due Year Four	0.6
Finance Lease, Liability, Payments, Due Year Five	0.6
2026 and thereafter	0.7
Total minimum lease payments	7.0
Less: interest	(0.7)
Present value	$ 6.3