Railcar Leasing and Management Services Group (Details 4) - Railcar Leasing and Management Services Group $ in Millions	Mar. 31, 2016 USD ($)
Railroad transportation equipment leased from independent owner trusts
Future operating lease obligations
Remaining nine months of 2016	$ 22.0
2017	29.2
2018	29.2
2019	28.8
2020	26.1
Thereafter	144.0
Total	279.3
Future contractual minimum rental revenues
Remaining nine months of 2016	36.2
2017	40.4
2018	30.6
2019	21.4
2020	12.8
Thereafter	23.0
Total	164.4
Other Third Parties [Member]
Future operating lease obligations
Remaining nine months of 2016	9.7
2017	12.1
2018	12.0
2019	9.5
2020	7.7
Thereafter	19.2
Total	70.2
Future contractual minimum rental revenues
Remaining nine months of 2016	14.4
2017	13.2
2018	7.9
2019	4.5
2020	2.6
Thereafter	4.3
Total	$ 46.9