Lease Disclosures Future minimum payments to be received as lessor under noncancelable direct financing leases (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019 (remaining nine months)	$ 12.1
2020	14.8
2021	11.7
2022	8.4
2023	3.6
Thereafter	3.7
Total minimum rents receivable	54.3
Less: unearned income	(11.4)
Total net investment in direct financing leases	42.9
Less: current portion	(11.2)
Long-term investment in direct financing leases	$ 31.7