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Investments in Affiliated Companies (Future Lease Receipts) (Details 7) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Schedule of Equity Method Investments [Line Items] |  |
2013 | $ 923.4 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent | [1]
2014 | 740.3 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears | [1]
2015 | 584.1 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears | [1]
2016 | 464.7 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears | [1]
2017 | 370.0 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears | [1]
Years thereafter | 770.4 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter | [1]
Total future receipts from leases | 3,852.9 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable | [1]
RRPF Joint Ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2013 | 303.5 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2014 | 271.1 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2015 | 239.7 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2016 | 218.1 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2017 | 167.8 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
Years thereafter | 428.5 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
Total future receipts from leases | 1,628.7 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
RRPF Joint Ventures [Member] | Rolls-Royce [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2013 | 144.6 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2014 | 129.3 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2015 | 109.7 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2016 | 102.4 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2017 | 97.1 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
Years thereafter | 212.3 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
Total future receipts from leases | 795.4 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable / dei_LegalEntityAxis = gmt_RollsRoyceMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
RRPF Joint Ventures [Member] | Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
2013 | 158.9 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2014 | 141.8 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2015 | 130.0 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2016 | 115.7 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
2017 | 70.7 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
Years thereafter | 216.2 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
Total future receipts from leases | $ 833.3 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable / dei_LegalEntityAxis = gmt_ThirdPartiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gmt_RrpfJointVenturesMember |
[1] | (1) The future contractual receipts due under our full-service operating leases include executory costs such as maintenance, car taxes, and insurance.

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- Definition Future minimum rental payments in aggregate as of the balance sheet date under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within one year of the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the fifth year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the fourth year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the third year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the second year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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