Insurance Receivable And Impairment (Narrative) (Details) - Customer One, Filed For Court Protection [Member] - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days covered of lost lease rental income		180 days
Percentage of containers on lease		92.00%
Recover and repair deductible		$ 0.5
Lost lease rental income deductible		2.0
Insurance receivable		3.2
Proceeds from insurance receivable		8.0
Dry Containers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment			$ 3.2
Insurance receivable		7.4	3.8
Estimated proceeds		2.2	1.2
Repair costs		1.5
Recovery costs		$ 3.7	$ 2.6
Subsequent Event [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from insurance receivable	$ 1.5