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v2.4.1.9

Debt (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Line of Credit Facility [Line Items] |  |  |
Non-Recourse Debt | $ 15.9 us-gaap_NonRecourseDebt | $ 72.6 us-gaap_NonRecourseDebt |
Operating assets pledged as collateral for notes | 95.9 gmt_OperatingAssetsPledgedAsCollateralForNotesOrOtherObligations |  |
Other Short-term Borrowings | 72.1 us-gaap_OtherShortTermBorrowings | 23.6 us-gaap_OtherShortTermBorrowings |
Fixed charge coverage ratio | 2.5 gmt_FixedChargeCoverageRatio |  |
Minimum debt covenant fixed charge coverage ratio | 1.2 gmt_MinimumDebtCovenantFixedChargeCoverageRatio |  |
Amount of secured debt available to be borrowed in accordance with public debt covenants | 1,283.1 gmt_AmountOfSecuredDebtAvailableToBeBorrowedInAccordanceWithPublicDebtCovenants |  |
Line of Credit US [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Unsecured revolving credit facility | 575 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditUsMember |  |
Availability under credit facility | 506.0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditUsMember |  |
Annual commitment fees | 0.8 us-gaap_LineOfCreditFacilityCommitmentFeeAmount / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditUsMember | 1.0 us-gaap_LineOfCreditFacilityCommitmentFeeAmount / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditUsMember | 1.2 us-gaap_LineOfCreditFacilityCommitmentFeeAmount / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditUsMember
Line of Credit Europe [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum amount of GRE transfer to GATX relating to loans and dividends | 111.3 gmt_MaximumAmountOfFundTransferRelatingToLoansAndDividends / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditEuropeMember |  |
Restricted net assets | 391.2 gmt_RestrictedNetAssets / us-gaap_LineOfCreditFacilityAxis = gmt_LineOfCreditEuropeMember |  |
Fair Value Hedging [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Derivative, Number of Instruments Held | 8 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember |
Commercial Paper [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Other Short-term Borrowings | $ 69.0 us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = us-gaap_CommercialPaperMember |  |

X
- Definition Amount of secured debt available to be borrowed in accordance with public debt covenants. + References No definition available. + Details
Name: | gmt_AmountOfSecuredDebtAvailableToBeBorrowedInAccordanceWithPublicDebtCovenants
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fixed charge coverage ratio. + References No definition available. + Details
Name: | gmt_FixedChargeCoverageRatio
Namespace Prefix: | gmt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount of fund transfer relating to loans and dividends. + References No definition available. + Details
Name: | gmt_MaximumAmountOfFundTransferRelatingToLoansAndDividends
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum debt covenant fixed charge coverage ratio. + References No definition available. + Details
Name: | gmt_MinimumDebtCovenantFixedChargeCoverageRatio
Namespace Prefix: | gmt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating assets pledged as collateral for notes or other obligations. + References No definition available. + Details
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Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted net assets. + References No definition available. + Details
Name: | gmt_RestrictedNetAssets
Namespace Prefix: | gmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

X
- Definition Amount of the fee for available but unused credit capacity under the credit facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property. + References No definition available. + Details
Name: | us-gaap_NonRecourseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than 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 19 -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 210.5-02.19(a)(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |