Derivative Instruments (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest rate swap, Expired, TRIP Holdings warehouse loan
Derivative Instruments, Gain (Loss) [Line Items]
Expected effect during next twelve months	$ 4.7		$ 4.7
Interest expense | Designated as hedging instrument | Interest rate swap, Expired, 2006 secured railcar equipment notes
Derivative Instruments, Gain (Loss) [Line Items]
Effect on interest expense	(0.1)	$ (0.1)	(0.2)	$ (0.2)
Expected effect during next twelve months	(0.2)		(0.2)
Interest expense | Designated as hedging instrument | Interest rate swap, Expired, Promissory notes
Derivative Instruments, Gain (Loss) [Line Items]
Effect on interest expense	0.0	0.5	0.0	1.2
Expected effect during next twelve months	0.0		0.0
Interest expense | Designated as hedging instrument | Interest rate swap, Expired, TRIP Holdings warehouse loan
Derivative Instruments, Gain (Loss) [Line Items]
Effect on interest expense	1.2	1.2	2.4	2.5
Expected effect during next twelve months	4.7		4.7
Interest expense | Designated as hedging instrument | Interest rate swap, Open, TRIP Master Funding secured railcar equipment notes
Derivative Instruments, Gain (Loss) [Line Items]
Loss on derivative, net	0.2	0.4	0.5	0.7
Expected effect during next twelve months	0.8		0.8
Interest expense | Designated as hedging instrument | Interest rate swap, Open, Promissory notes
Derivative Instruments, Gain (Loss) [Line Items]
Loss on derivative, net	0.0	$ 1.6	0.0	$ 5.3
Expected effect during next twelve months	$ 0.0		$ 0.0