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Investments in Affiliated Companies (Textual) (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 ($) | Dec. 31, 2014 RRPF Joint Ventures [Member] USD ($) Business_Activity Joint_Venture | Dec. 31, 2013 RRPF Joint Ventures [Member] USD ($) | Dec. 31, 2012 RRPF Joint Ventures [Member] USD ($) | Dec. 31, 2014 RRPF Joint Ventures [Member] Minimum [Member] | Dec. 31, 2014 RRPF Joint Ventures [Member] Maximum [Member] | Dec. 31, 2014 RRPF Joint Ventures [Member] Aircraft Engines [Member] | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($) | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Accumulated Other-than-Temporary Impairment [Member] Fair Value, Inputs, Level 3 [Member] Equity Method Investments [Member] USD ($) | 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 (€) | Dec. 31, 2013 Singco/Somagas [Member] USD ($) | Dec. 31, 2013 Singco/Somagas [Member] USD ($) | Dec. 31, 2014 Aae Cargo Ag [Member] USD ($) | Dec. 31, 2013 Aae Cargo Ag [Member] USD ($) | Dec. 31, 2012 Aae Cargo Ag [Member] USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Value of Assets Acquired | $ 1.1 us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 | $ 174.7 us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101.3 us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gmt_SingcoSomagasMember |  |  |
Loans to affiliated companies | 16.3 us-gaap_AdvancesToAffiliate | 24.2 us-gaap_AdvancesToAffiliate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | 1.3 us-gaap_AssetImpairmentCharges | 5.9 us-gaap_AssetImpairmentCharges | 5.0 us-gaap_AssetImpairmentCharges |  |  |  |  |  |  | 14.8 us-gaap_AssetImpairmentCharges / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 14.8 us-gaap_AssetImpairmentCharges / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember |  |  |  |  |  |  |  |  |
GATX ownership percentage in joint venture |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint venture investments |  |  |  | 14 gmt_NumberOfJointVentureInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business activities |  |  |  | 2 gmt_NumberOfBusinessActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of depreciable assets |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  | 7 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Share of affiliates' earnings (net of tax) | 49.5 us-gaap_IncomeLossFromEquityMethodInvestments | 75.8 us-gaap_IncomeLossFromEquityMethodInvestments | 19.6 us-gaap_IncomeLossFromEquityMethodInvestments | 42.2 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember | 46.5 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember | 36.7 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | 37.50%us-gaap_MinorityInterestOwnershipPercentageByParent / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | 37.50%us-gaap_MinorityInterestOwnershipPercentageByParent / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember |  |  |  |  |
Gain on Sale of Investments |  | 2.5 us-gaap_GainOnSaleOfInvestments |  |  |  |  |  |  |  |  |  |  |  | 9.3 us-gaap_GainOnSaleOfInvestments / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember |  |  |  |  |  |
gmt_SalePrice |  |  |  |  |  |  |  |  |  |  |  |  |  | 114.1 gmt_Gmt_SalePrice / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23.0 us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_SingcoSomagasMember |  |  |  |
Portfolio proceeds | $ 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 |  |  | $ 0 gmt_PortfolioProceeds / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gmt_AaeCargoAgMember | $ 91.1 gmt_PortfolioProceeds / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gmt_AaeCargoAgMember | $ 0 gmt_PortfolioProceeds / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gmt_AaeCargoAgMember

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- Definition Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.2) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 6 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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