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Leases (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Direct Financing [Abstract] |  |
Total minimum lease payments receivable, Direct Financing | $ 204.8 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived | $ 270.2 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived
Estimated non-guaranteed residual value of leased assets, Direct Financing | 68.5 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty | 79.8 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty
Unearned income, Direct Financing | (98.6)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome | (142.7)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome
Finance leases, Direct Financing | $ 174.7 gmt_DirectFinancingLeasesNetInvestmentInDirectFinancingLeasesDisclosureFinanceLeaseNetOfUnearnedIncome | $ 207.3 gmt_DirectFinancingLeasesNetInvestmentInDirectFinancingLeasesDisclosureFinanceLeaseNetOfUnearnedIncome

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- Definition Direct financing leases net investment in direct financing leases disclosure finance lease net of unearned income. + References No definition available. + Details
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- Details
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- Definition The remaining (unamortized) difference between the gross investment in a direct financing lease and the cost or carrying amount, if different, of the leased property as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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- Definition Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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- Definition The estimate of the lease property's economic value at the end of the direct financing lease term excluding any amounts guaranteed by either the lessee or a third-party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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