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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 03, 2015
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Subsequent Event [Line Items] |  |  |
Long-term Debt, Gross | $ 4,195.8 us-gaap_DebtInstrumentCarryingAmount | $ 3,838.5 us-gaap_DebtInstrumentCarryingAmount |
Subsequent Event [Member] | Recourse Fixed Rate Debt Unsecured Twenty One [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Long-term Debt, Gross |  |  | 100.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = gmt_RecourseFixedRateDebtUnsecuredTwentyOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 2.60%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = gmt_RecourseFixedRateDebtUnsecuredTwentyOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Recourse Fixed Rate Debt Unsecured Twenty Two [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Long-term Debt, Gross |  |  | 300.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = gmt_RecourseFixedRateDebtUnsecuredTwentyTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 3.25%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = gmt_RecourseFixedRateDebtUnsecuredTwentyTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Recourse Fixed Rate Debt Unsecured Twenty Three [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Long-term Debt, Gross |  |  | $ 250.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = gmt_RecourseFixedRateDebtUnsecuredTwentyThreeMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 4.50%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = gmt_RecourseFixedRateDebtUnsecuredTwentyThreeMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |