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v2.4.1.9

Loans (Details) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Aae Cargo Ag [Member] USD ($) | Dec. 31, 2014 Aae Cargo Ag [Member] EUR (€) | Dec. 31, 2013 Aae Cargo Ag [Member] USD ($) | Dec. 31, 2013 Aae Cargo Ag [Member] EUR (€)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Portfolio proceeds and other | $ 264.0 gmt_PortfolioProceeds | $ 385.3 gmt_PortfolioProceeds | $ 288.9 gmt_PortfolioProceeds | $ 77.0 gmt_PortfolioProceeds / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | € 68.2 gmt_PortfolioProceeds / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | $ 91.1 gmt_PortfolioProceeds / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | € 67.5 gmt_PortfolioProceeds / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember
Portfolio Proceeds, Principal |  |  |  | 76.2 gmt_PortfolioProceedsPrincipal / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | 67.5 gmt_PortfolioProceedsPrincipal / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember |  |
Portfolio Proceeds, Interest |  |  |  | 0.8 gmt_PortfolioProceedsInterest / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | 0.7 gmt_PortfolioProceedsInterest / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember |  |
2014 | 86.4 gmt_LoanReceivablesFutureMinimumPaymentsCurrent |  |  |  |  |  |
2015 | 4.3 gmt_LoanReceivablesFutureMinimumPaymentsInTwoYears |  |  |  |  |  |
2016 | 2.0 gmt_LoanReceivablesFutureMinimumPaymentsInThreeYears |  |  |  |  |  |
2017 | 4.6 gmt_LoanReceivablesFutureMinimumPaymentsInFourYears |  |  |  |  |  |
2018 | 0 gmt_LoanReceivablesFutureMinimumPaymentsInFiveYears |  |  |  |  |  |
Thereafter | 0 gmt_LoanReceivablesFutureMinimumPaymentsThereafter |  |  |  |  |  |
Loans receivables, outstanding | $ 97.3 gmt_LoansReceivablesGrossCarryingAmount | $ 122.7 gmt_LoansReceivablesGrossCarryingAmount |  |  |  |  |

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- Definition Future loan payments receivable within one year of the balance sheet date. + References No definition available. + Details
Name: | gmt_LoanReceivablesFutureMinimumPaymentsCurrent
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Future loan payments receivable within five years of the balance sheet date. + References No definition available. + Details
Name: | gmt_LoanReceivablesFutureMinimumPaymentsInFiveYears
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future loan payments receivable within four years of the balance sheet date. + References No definition available. + Details
Name: | gmt_LoanReceivablesFutureMinimumPaymentsInFourYears
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future loan payments receivable within three years of the balance sheet date. + References No definition available. + Details
Name: | gmt_LoanReceivablesFutureMinimumPaymentsInThreeYears
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future loan payments receivable within two years of the balance sheet date. + References No definition available. + Details
Name: | gmt_LoanReceivablesFutureMinimumPaymentsInTwoYears
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future loan payments receivable greater than five years of the balance sheet date. + References No definition available. + Details
Name: | gmt_LoanReceivablesFutureMinimumPaymentsThereafter
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans receivables gross carrying amount. + References No definition available. + Details
Name: | gmt_LoansReceivablesGrossCarryingAmount
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Portfolio proceeds. + References No definition available. + Details
Name: | gmt_PortfolioProceeds
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Portfolio Proceeds, Interest + References No definition available. + Details
Name: | gmt_PortfolioProceedsInterest
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Portfolio Proceeds, Principal + References No definition available. + Details
Name: | gmt_PortfolioProceedsPrincipal
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration