Supplemental Cash Flow and Noncash Investing Transactions (Details Textual) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015 EUR (€) Car	Dec. 31, 2015 USD ($) Car	Dec. 31, 2014 USD ($) Car	Dec. 31, 2013 EUR (€) Car	Dec. 31, 2013 USD ($) Car
Noncash or Part Noncash Divestitures [Line Items]
Portfolio proceeds		$ 482.2	$ 264.0		$ 385.3
Supplemental Cash Flow and Noncash Investing and Financing Transactions (Textual) [Abstract]
Aggregate fair value of liquidating distributions			$ 1.1		$ 22.9
Number of railcars received | Car	157	157	62	640	640
Singco/Somagas [Member]
Supplemental Cash Flow and Noncash Investing and Financing Transactions (Textual) [Abstract]
Aggregate fair value of liquidating distributions					$ 151.8
Aae Cargo Ag [Member]
Noncash or Part Noncash Divestitures [Line Items]
Portfolio proceeds		$ 0.0	$ 0.0		91.1
Aae Cargo Ag [Member]
Noncash or Part Noncash Divestitures [Line Items]
Portfolio proceeds	€ 68.2	$ 77.2		€ 67.5	$ 91.1