Railcar Leasing and Management Services Group (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Future operating lease obligations and future contractual minimum rental revenues related to these leases
2012	$ 4.3
2013	2.4
2014	1.7
2015	1.3
2016	1.0
Thereafter	1.9
Leasing Group [Member]
Future operating lease obligations and future contractual minimum rental revenues related to these leases
2012	349.5
2013	268.3
2014	195.4
2015	150.0
2016	110.5
Thereafter	237.5
Total	1,311.2
Leasing Group [Member] \| Future operating lease obligations of Trusts' railcar [Member]
Future operating lease obligations and future contractual minimum rental revenues related to these leases
2012	44.5
2013	45.7
2014	44.9
2015	43.2
2016	40.2
Thereafter	341.8
Total	560.3
Leasing Group [Member] \| Future Contractual Minimum Rental Revenues Of Trusts Railcar [Member]
Future operating lease obligations and future contractual minimum rental revenues related to these leases
2012	57.5
2013	40.7
2014	26.3
2015	19.8
2016	12.5
Thereafter	24.0
Total	$ 180.8

The total of future contractually required payments on leases defined as operating.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph b(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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