Leases, Lessor - Direct Financing Leases (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Lessor - Direct Financing Leases [Abstract]
Net investment in direct financing leases	$ 90.4	$ 103.5	$ 106.4
Minimum [Member]
Lessor - Direct Financing Leases [Abstract]
Term of direct financing leases	3 years
Maximum [Member]
Lessor - Direct Financing Leases [Abstract]
Term of direct financing leases	10 years