Derivative Instruments (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest rate swap, Expired, TRIP Holdings warehouse loan
Derivative Instruments, Gain (Loss) [Line Items]
Expected effect during next twelve months	$ 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)
Expected effect during next twelve months	(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	0.7
Expected effect during next twelve months	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	1.3
Expected effect during next twelve months	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	0.3	0.3
Expected effect during next twelve months	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	$ 3.7
Expected effect during next twelve months	$ 0.0