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Investments in Affiliated Companies (Significant Investments in Affiliates) (Details 1) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) Vessel | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Rolls Royce Partners Finance [Member] USD ($) | Dec. 31, 2014 Cardinal Marine Investments Llc [Member] USD ($) | Dec. 31, 2014 Adler Funding Llc [Member] USD ($) | Dec. 31, 2014 Other Affiliates [Member] USD ($) | Dec. 31, 2014 RRPF Joint Ventures [Member] Joint_Venture | Dec. 31, 2013 Singco/Somagas [Member] USD ($) | Dec. 31, 2014 Intermodal Investment Fund V and VII [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 (€)
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances to Affiliate | $ 16.3 us-gaap_AdvancesToAffiliate | $ 24.2 us-gaap_AdvancesToAffiliate |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Net Sales Proceeds | 19.4 us-gaap_EquityMethodInvestmentNetSalesProceeds | 55.6 us-gaap_EquityMethodInvestmentNetSalesProceeds | 12.5 us-gaap_EquityMethodInvestmentNetSalesProceeds |  |  |  |  |  |  |  | 18.3 us-gaap_EquityMethodInvestmentNetSalesProceeds / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_IntermodalInvestmentFundVandVIIMember |  |  |  |
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
Number of vessels received |  | 5 gmt_Numberofvesselsreceived |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates, Schedule of Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliated companies | 357.7 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 354.3 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 502.0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 293.6 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RollsRoycePartnersFinanceMember | [1] | 45.1 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_CardinalMarineInvestmentsLlcMember | 16.9 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_AdlerFundingLlcMember | 2.1 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_OtherAffiliatesMember |  |  |  |  |  |  |
GATX's Percentage Ownership |  |  |  | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RollsRoycePartnersFinanceMember | [1] | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_CardinalMarineInvestmentsLlcMember | 12.50%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_AdlerFundingLlcMember |  |  |  |  |  |  | 37.50%us-gaap_MinorityInterestOwnershipPercentageByParent / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember | 37.50%us-gaap_MinorityInterestOwnershipPercentageByParent / gmt_VariableInterestEntitiesByClassificationOfAssetsAxis = gmt_AaeCargoAgMember
Number of joint venture investments |  |  |  |  |  |  |  |  | 14 gmt_NumberOfJointVentureInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |  |  |  |  |  |
Fair Value of Assets Acquired | $ 1.1 us-gaap_FairValueOfAssetsAcquired | $ 22.9 us-gaap_FairValueOfAssetsAcquired | $ 0 us-gaap_FairValueOfAssetsAcquired |  |  |  |  |  |  | $ 151.8 us-gaap_FairValueOfAssetsAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gmt_SingcoSomagasMember |  |  |  |  |
[1] | (1) Combined investment balances of fourteen separate joint ventures (collectively, the "RRPF affiliates")

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