Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Designated as hedging instrument Expired hedges 2006 secured railcar equipment notes		Jun. 30, 2014 Designated as hedging instrument Expired hedges Promissory notes		Jun. 30, 2014 Designated as hedging instrument Expired hedges TRIP Holdings warehouse loan		Jun. 30, 2014 Designated as hedging instrument Open hedges Promissory notes		Jun. 30, 2014 Designated as hedging instrument Open hedges TRIP Master Funding secured railcar equipment notes		Jul. 31, 2011 Designated as hedging instrument Open hedges TRIP Master Funding secured railcar equipment notes
Interest rate hedges included in balance sheet
Notional Amount			$ 200.0		$ 370.0		$ 788.5		$ 401.5		$ 61.5		$ 94.1
Interest Rate			4.87%	[1]	5.34%	[1]	3.60%	[1]	4.13%	[1]	2.62%	[1]
Liability			0		0		0		14.2		2.3
AOCL – loss/ (income)	13.0	18.7	(1.5)		2.6		11.1		12.8		1.0
Noncontrolling Interest			$ 0		$ 0		$ 15.0		$ 0		$ 1.3

[1] Weighted average fixed interest rate