Railcar Leasing and Management Services Group (Details 3) - Element Financial Corporation - USD ($) $ in Millions	12 Months Ended		25 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]
Proceeds from sale leased railcars	$ 750.8	$ 882.7	$ 1,738.5
Railcar Leasing and Management Services Group | Railcars owned one year or less at the time of sale
Property Subject to or Available for Operating Lease [Line Items]
Proceeds from sale leased railcars	228.6	446.6
Railcar Leasing and Management Services Group | Railcars owned more than one year at the time of sale
Property Subject to or Available for Operating Lease [Line Items]
Proceeds from sale leased railcars	294.7	235.7
Rail Group
Property Subject to or Available for Operating Lease [Line Items]
Proceeds from sale leased railcars	$ 227.5	$ 200.4