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Fair Value Disclosure (Details 3) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets |  |
Loans | $ 97.3 gmt_LoansReceivablesGrossCarryingAmount | $ 122.7 gmt_LoansReceivablesGrossCarryingAmount
Liabilities |  |
Non-Recourse Debt | 15.9 us-gaap_NonRecourseDebt | 72.6 us-gaap_NonRecourseDebt
Carrying Amount [Member] |  |
Assets |  |
Investment Funds | 1.5 us-gaap_CostMethodInvestmentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1.7 us-gaap_CostMethodInvestmentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans |  | 122.7 gmt_LoansReceivablesGrossCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Liabilities |  |
Recourse fixed rate debt | 3,639.9 gmt_RecourseFixedRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 2,871.2 gmt_RecourseFixedRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Recourse floating rate debt | 540.0 gmt_RecourseFloatingRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 894.7 gmt_RecourseFloatingRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Nonrecourse debt |  | 72.6 gmt_NonrecourseDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value Measurement [Member] |  |
Assets |  |
Investment Funds | 2.4 us-gaap_CostMethodInvestmentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 4.0 us-gaap_CostMethodInvestmentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Loans | 97.4 gmt_LoansReceivablesGrossCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 121.5 gmt_LoansReceivablesGrossCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Liabilities |  |
Recourse fixed rate debt | 3,775.0 gmt_RecourseFixedRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,994.0 gmt_RecourseFixedRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Recourse floating rate debt | 540.0 gmt_RecourseFloatingRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 906.2 gmt_RecourseFloatingRateDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Nonrecourse debt | $ 16.6 gmt_NonrecourseDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 74.7 gmt_NonrecourseDebtFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition Fair value portion of investments accounted under the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592 + Details
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