XML 173 R123.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Legal Proceedings and Other Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Oct. 02, 2013 Insurance_Provider | Dec. 14, 2012 Employee Corporations | Jun. 29, 2009 | Jan. 31, 2015 case
Loss Contingencies [Line Items] |  |  |  |  |  |
Accruals for losses related to probable litigation matters | $ 1.7 us-gaap_LitigationReserve |  |  |  |  |
Number of sites for which the Company is involved in environmental remediation | 18 gmt_AdministrativeAndJudicialProceedingsAtSites |  |  |  |  |
Accruals for remediation and restoration | 13.8 us-gaap_AccrualForEnvironmentalLossContingencies | 14.7 us-gaap_AccrualForEnvironmentalLossContingencies |  |  |  |
Viareggio [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of casualties |  |  |  |  | 32 gmt_NumberOfCasualties / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |
Number of subsidiaries |  |  |  | 2 gmt_NumberOfSubsidiaries / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |
Number of Italian railway companies |  |  |  | 4 gmt_NumberOfCompanies / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |
Number of employees |  |  |  | 18 dei_EntityNumberOfEmployees / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |
Number of insurers |  |  | 3 gmt_NumberOfInsuranceProviders / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |  |
Asbestos - related cases pending against the company and its subsidiaries | 90 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |  |  |  |
Legal Fees | $ 7.8 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |  |  |  |
Number of Maintenance and Supervisory employees |  |  |  | 10 gmt_NumberofMaintenanceandSupervisoryemployees / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |
Court Proceedings | 1 gmt_CourtProceedings / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |  |  |  |
Percentage of coverage held by Liberty Mutual Insurance Europe Limited |  |  | 25.00%gmt_PercentageofcoverageheldbyLibertyMutualInsuranceEuropeLimited / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |  |  |
Asbestos Issue [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
New cases filed number | 7 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember |  |  |  |  |
Cases dismissed or settled | 34 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember |  |  |  |  |
Pending Litigation [Member] | Asbestos Cases [Member] | Subsequent Event [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Asbestos - related cases pending against the company and its subsidiaries |  |  |  |  |  | 104 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_AsbestosCasesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Pending Litigation [Member] | Asbestos Cases [Member] | Subsequent Event [Member] | Jones Act claims [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Asbestos - related cases pending against the company and its subsidiaries |  |  |  |  |  | 87 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = gmt_JonesActClaimsMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_AsbestosCasesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Punctured and Ignited [Member] | Viareggio [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
number of railcars |  |  |  |  | 1 gmt_NumberOfRailars / gmt_LitigationCaseDetailsAxis = gmt_PuncturedAndIgnitedMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |
Overturned [Member] | Viareggio [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
number of railcars |  |  |  |  | 5 gmt_NumberOfRailars / gmt_LitigationCaseDetailsAxis = gmt_OverturnedMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |
Derailed [Member] | Viareggio [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
number of railcars |  |  |  |  | 14 gmt_NumberOfRailars / gmt_LitigationCaseDetailsAxis = gmt_DerailedMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = gmt_ViareggioMember |

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Administrative and judicial proceedings at sites. + References No definition available. + Details
Name: | gmt_AdministrativeAndJudicialProceedingsAtSites
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Court Proceedings + References No definition available. + Details
Name: | gmt_CourtProceedings
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Casualties + References No definition available. + Details
Name: | gmt_NumberOfCasualties
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Companies + References No definition available. + Details
Name: | gmt_NumberOfCompanies
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Insurance Providers + References No definition available. + Details
Name: | gmt_NumberOfInsuranceProviders
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The titles of those who charges were brought against for negligence-based crimes in relation to the Viareggio accident. + References No definition available. + Details
Name: | gmt_NumberofMaintenanceandSupervisoryemployees
Namespace Prefix: | gmt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of railcars + References No definition available. + Details
Name: | gmt_NumberOfRailars
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Subsidiaries + References No definition available. + Details
Name: | gmt_NumberOfSubsidiaries
Namespace Prefix: | gmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of coverage held by Liberty Mutual Insurance Europe Limited + References No definition available. + Details
Name: | gmt_PercentageofcoverageheldbyLibertyMutualInsuranceEuropeLimited
Namespace Prefix: | gmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_LegalFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 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 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LitigationReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The number of claims settled and dismissed during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyClaimsSettledAndDismissedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | gmt_LitigationCaseDetailsAxis=gmt_DerailedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gmt_LitigationCaseDetailsAxis=gmt_OverturnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gmt_LitigationCaseDetailsAxis=gmt_PuncturedAndIgnitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=gmt_ViareggioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_AsbestosIssueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |