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Non-Recourse Debt (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Gross operating lease rentals and future payments on direct financing leases $ 3.8
Assets pledged as collateral $ 7.1
Notes maturity date, description The notes mature from 2020 through 2028
Minimum [Member]  
Debt Instrument [Line Items]  
Fixed interest rate on notes 3.70%
Maximum [Member]  
Debt Instrument [Line Items]  
Fixed interest rate on notes 4.66%