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Schedule I - Condensed Financial Information of Registrant - Statements of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | $ 1,086.6 gmt_LeaseIncome | $ 975.2 gmt_LeaseIncome | $ 917.0 gmt_LeaseIncome
Other revenue |  |  |  |  |  |  |  |  | 78.1 us-gaap_OtherNonoperatingIncome | 70.7 us-gaap_OtherNonoperatingIncome | 60.7 us-gaap_OtherNonoperatingIncome
Total Revenues | 401.4 us-gaap_Revenues | 397.2 us-gaap_Revenues | 365.8 us-gaap_Revenues | 286.6 us-gaap_Revenues | 356.6 us-gaap_Revenues | 353.2 us-gaap_Revenues | 338.9 us-gaap_Revenues | 272.3 us-gaap_Revenues | 1,451.0 us-gaap_Revenues | 1,321.0 us-gaap_Revenues | 1,243.2 us-gaap_Revenues
Maintenance expense |  |  |  |  |  |  |  |  | 337.0 us-gaap_CostOfPropertyRepairsAndMaintenance | 294.0 us-gaap_CostOfPropertyRepairsAndMaintenance | 269.7 us-gaap_CostOfPropertyRepairsAndMaintenance
Depreciation |  |  |  |  |  |  |  |  | 273.5 us-gaap_DepreciationNonproduction | 255.0 us-gaap_DepreciationNonproduction | 237.4 us-gaap_DepreciationNonproduction
Operating lease expense |  |  |  |  |  |  |  |  | 108.7 us-gaap_OperatingLeasesRentExpenseNet | 129.4 us-gaap_OperatingLeasesRentExpenseNet | 130.2 us-gaap_OperatingLeasesRentExpenseNet
Other operating expense |  |  |  |  |  |  |  |  | 28.9 us-gaap_OtherCostAndExpenseOperating | 26.1 us-gaap_OtherCostAndExpenseOperating | 24.2 us-gaap_OtherCostAndExpenseOperating
Selling, general and administrative |  |  |  |  |  |  |  |  | 189.2 us-gaap_SellingGeneralAndAdministrativeExpense | 178.3 us-gaap_SellingGeneralAndAdministrativeExpense | 160.2 us-gaap_SellingGeneralAndAdministrativeExpense
Total Expenses |  |  |  |  |  |  |  |  | 1,135.1 us-gaap_OperatingExpenses | 1,072.6 us-gaap_OperatingExpenses | 1,004.1 us-gaap_OperatingExpenses
Net gain on asset dispositions |  |  |  |  |  |  |  |  | 87.2 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges | 85.6 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges | 79.5 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Interest expense, net |  |  |  |  |  |  |  |  | (158.4)us-gaap_InterestExpense | (166.6)us-gaap_InterestExpense | (166.6)us-gaap_InterestExpense
Other (expense) income |  |  |  |  |  |  |  |  | (13.5)us-gaap_OtherNonoperatingIncomeExpense | (8.4)us-gaap_OtherNonoperatingIncomeExpense | (8.2)us-gaap_OtherNonoperatingIncomeExpense
Income before Income Taxes and Share of Affiliates’ Earnings |  |  |  |  |  |  |  |  | 231.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 159.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 143.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit |  |  |  |  |  |  |  |  | (75.7)us-gaap_IncomeTaxExpenseBenefit | (65.5)us-gaap_IncomeTaxExpenseBenefit | (26.1)us-gaap_IncomeTaxExpenseBenefit
Share of affiliates' earnings (net of tax) |  |  |  |  |  |  |  |  | 49.5 us-gaap_IncomeLossFromEquityMethodInvestments | 75.8 us-gaap_IncomeLossFromEquityMethodInvestments | 19.6 us-gaap_IncomeLossFromEquityMethodInvestments
Net Income | 58.5 us-gaap_NetIncomeLoss | 51.3 us-gaap_NetIncomeLoss | 53.1 us-gaap_NetIncomeLoss | 42.1 us-gaap_NetIncomeLoss | 53.3 us-gaap_NetIncomeLoss | 53.8 us-gaap_NetIncomeLoss | 35.1 us-gaap_NetIncomeLoss | 27.1 us-gaap_NetIncomeLoss | 205.0 us-gaap_NetIncomeLoss | 169.3 us-gaap_NetIncomeLoss | 137.3 us-gaap_NetIncomeLoss
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (79.1)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 25.8 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 25.0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Unrealized gain (loss) on securities |  |  |  |  |  |  |  |  | (0.1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 0.8 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 0.2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Unrealized gain (loss) on derivative instruments |  |  |  |  |  |  |  |  | 3.0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 22.4 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 11.7 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Post-retirement benefit plans |  |  |  |  |  |  |  |  | (29.5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 52.9 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (12.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (105.7)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 101.9 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 24.5 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive Income |  |  |  |  |  |  |  |  | 99.3 us-gaap_ComprehensiveIncomeNetOfTax | 271.2 us-gaap_ComprehensiveIncomeNetOfTax | 161.8 us-gaap_ComprehensiveIncomeNetOfTax
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 669.7 gmt_LeaseIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 543.0 gmt_LeaseIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 504.5 gmt_LeaseIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other revenue |  |  |  |  |  |  |  |  | 60.2 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51.3 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43.5 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Revenues |  |  |  |  |  |  |  |  | 729.9 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 594.3 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 548.0 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Maintenance expense |  |  |  |  |  |  |  |  | 227.6 us-gaap_CostOfPropertyRepairsAndMaintenance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 176.5 us-gaap_CostOfPropertyRepairsAndMaintenance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 154.8 us-gaap_CostOfPropertyRepairsAndMaintenance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Depreciation |  |  |  |  |  |  |  |  | 147.7 us-gaap_DepreciationNonproduction / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 131.1 us-gaap_DepreciationNonproduction / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 122.2 us-gaap_DepreciationNonproduction / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating lease expense |  |  |  |  |  |  |  |  | 83.0 us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89.5 us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 91.6 us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other operating expense |  |  |  |  |  |  |  |  | 17.1 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12.7 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12.0 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 139.7 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 131.1 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 118.4 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Expenses |  |  |  |  |  |  |  |  | 615.1 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 540.9 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 499.0 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net gain on asset dispositions |  |  |  |  |  |  |  |  | 67.9 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 68.6 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 59.4 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense, net |  |  |  |  |  |  |  |  | (66.7)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (63.7)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (65.4)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other (expense) income |  |  |  |  |  |  |  |  | 2.5 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7.0)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4.4)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before Income Taxes and Share of Affiliates’ Earnings |  |  |  |  |  |  |  |  | 118.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit |  |  |  |  |  |  |  |  | (41.7)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (10.7)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Share of affiliates' earnings (net of tax) |  |  |  |  |  |  |  |  | 128.2 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 128.7 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 97.7 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income |  |  |  |  |  |  |  |  | 205.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 169.3 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 137.3 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (79.1)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25.8 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25.0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrealized gain (loss) on securities |  |  |  |  |  |  |  |  | (0.1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.8 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrealized gain (loss) on derivative instruments |  |  |  |  |  |  |  |  | 3.0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22.4 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11.7 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Post-retirement benefit plans |  |  |  |  |  |  |  |  | (29.5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 52.9 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (105.7)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 101.9 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 24.5 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive Income |  |  |  |  |  |  |  |  | $ 99.3 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 271.2 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 161.8 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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