Legal Proceedings and Other Contingencies	12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings and Other Contingencies	OTE 23. Legal Proceedings and Other Contingencies Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against GATX and certain of our subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved or settled adversely. Viareggio Derailment In June 2009, a train consisting of fourteen liquefied petroleum gas (“LPG”) tank cars owned by GATX Rail Austria GmbH (an indirect subsidiary of the Company, "GATX Rail Austria") and its subsidiaries derailed while passing through the City of Viareggio, in the province of Lucca, Italy. Five tank cars overturned and one of the overturned cars was punctured by a peg or obstacle along the side of the track, resulting in a release of LPG, which subsequently ignited. Thirty-two people died and others were injured in the fire, which also resulted in property damage. The LPG tank cars were leased to FS Logistica S.p.A., a subsidiary of the Italian state-owned railway, Ferrovie dello Stato S.p.A (the “Italian Railway”). On December 14, 2012, the Public Prosecutors of Lucca ("Public Prosecutors") formally charged GATX Rail Austria and two of its subsidiaries (collectively, "GRA"), as well as ten maintenance and supervisory employees (the "Employees"), with various negligence-based crimes related to the accident, all of which are punishable under Italian law by incarceration, damages and fines. Similar charges were brought against four Italian Railway companies and eighteen of their employees, among others. The Public Prosecutors assert that the axle on a tank car broke, causing the derailment and resulting in a tank rupture and release of LPG, after the car hit an obstacle placed on the side of the track by the Italian Railway. The Public Prosecutors further allege that a crack in the axle was detectable at the time of final inspection but was overlooked by the Employees at the Jungenthal Waggon GmbH workshop (a subsidiary of GATX Rail Austria). The trial in the Court of Lucca (the “Lucca Trial”) commenced on November 13, 2013. With respect to civil claims, GRA’s insurers continue to work cooperatively with the insurer for the Italian Railway to adjust and settle personal injury and property damage claims. These joint settlement efforts have so far settled most of the significant civil claims related to the accident; however, approximately 90 civil claimants did not settle and are currently parties to the Lucca Trial. The Court of Lucca will determine both the civil and criminal liability of the defendants in the one proceeding. GRA believes that it and its Employees acted diligently and properly with respect to applicable legal and industry standards, but expects that its insurers will cover any civil damages if awarded to the claimants in the Lucca trial. Since May 2012, the excess insurer providing coverage, Liberty Mutual Insurance Europe Limited (“Liberty”) has settled civil claims but has refused to reimburse GRA for its ongoing legal defense fees and costs, taking a position contrary to insurers in the prior underlying layers who had provided coverage for such expenses. To date, GRA has incurred approximately $5.0 million in unreimbursed defense fees and costs at the Liberty coverage layer and continues to incur costs in connection with the Lucca Trial. Consequently, in October 2013, GRA filed an arbitration proceeding against Liberty seeking to recoup its unreimbursed defense fees and costs (the “Liberty Arbitration”). The Liberty excess layer is currently fully exhausted and, therefore, the issue of reimbursement for outstanding defense costs will now be determined by the four insurers in the next coverage layer, which includes 25% held by Liberty. GRA cannot predict the outcome of the Liberty Arbitration, the amount of defense fees and costs that ultimately may not be reimbursed by Liberty, or the positions other excess insurers in the current coverage layer may take with respect to defense fees and costs. GATX cannot predict the outcome of the Lucca Trial or what other legal proceedings or claims, if any, may be initiated against GRA or its personnel, and, therefore, cannot reasonably estimate the possible amount or range of loss that may ultimately be incurred in connection with this accident. Accordingly, we have not established any accruals with respect to this matter. Other Litigation GATX and its subsidiaries have been named as defendants in various other legal actions and claims, governmental proceedings and private civil suits arising in the ordinary course of business, including environmental matters, workers’ compensation claims and other personal injury claims. Some of these proceedings include claims for punitive as well as compensatory damages. Several of our subsidiaries have also been named as defendants or co-defendants in cases alleging injury caused by exposure to asbestos. The plaintiffs seek an unspecified amount of damages based on common law, statutory or premises liability or, in the case of ASC, the Jones Act, which provides limited remedies to certain maritime employees. As of January 31, 2014, there were 140 asbestos-related cases pending against GATX and its subsidiaries. Of the total number of pending cases, 116 are Jones Act claims, most of which were filed against ASC before the year 2000. During 2013, 10 new cases were filed, and 61 cases were dismissed without payment or otherwise settled for an immaterial amount. In addition, demand has been made against GATX for asbestos-related claims under limited indemnities given in connection with the sale of certain of our former subsidiaries. It is possible that the number of these cases or claims for indemnity could begin to grow and that the cost of these cases, including costs to defend, could correspondingly increase in the future. Litigation Accruals We have recorded accruals totaling $1.9 million at December 31, 2013, for losses related to those litigation matters that we believe to be probable and for which an amount of loss can be reasonably estimated. However, we cannot determine a reasonable estimate of the maximum possible loss or range of loss for these matters given that they are at various stages of the litigation process and each case is subject to the inherent uncertainties of litigation (such as the strength of our legal defenses and the availability of insurance recovery). Although the maximum amount of liability that may ultimately result from any of these matters cannot be predicted with absolute certainty, management expects that none of the matters for which we have recorded an accrual, when ultimately resolved, will have a material adverse effect on our consolidated financial position or liquidity. It is possible, however, that the ultimate resolution of one or more of these matters could have a material adverse effect on our results of operations in a particular quarter or year if such resolution results in liability that materially exceeds the accrued amount. In addition, other litigation matters are pending for which we have not recorded any accruals because our potential liability for those matters is not probable or cannot be reasonably estimated based on currently available information. For those matters where we have not recorded an accrual but a loss is reasonably possible, we cannot determine a reasonable estimate of the maximum possible loss or range of loss for these matters given that they are at various stages of the litigation process and each case is subject to the inherent uncertainties of litigation (such as the strength of our legal defenses and the availability of insurance recovery). Although the maximum amount of liability that may ultimately result from any of these matters cannot be predicted with absolute certainty, management expects that none of the matters for which we have not recorded an accrual, when ultimately resolved, will have a material adverse effect on our consolidated financial position or liquidity. It is possible, however, that the ultimate resolution of one or more of these matters could have a material adverse effect on our results of operations in a particular quarter or year if such resolution results in a significant liability for GATX. Environmental Our operations are subject to extensive federal, state and local environmental regulations. Our operating procedures include practices to protect the environment from the risks inherent in full service railcar leasing, which involves maintaining railcars used by customers to transport chemicals and other hazardous materials. Additionally, some of our real estate holdings, including previously owned properties, are or have been used for industrial or transportation-related purposes or leased to commercial or industrial companies whose activities might have resulted in discharges on the property. As a result, we are subject to environmental cleanup and enforcement actions. In particular, the federal Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), also known as the Superfund law, as well as similar state laws, impose joint and several liability for cleanup and enforcement costs on current and former owners and operators of a site without regard to fault or the legality of the original conduct. If there are other potentially responsible parties (“PRPs”), we generally contribute to the cleanup of these sites through cost-sharing agreements with terms that vary from site to site. Costs are typically allocated based on the relative volumetric contribution of material, the period of time the site was owned or operated, and/or the portion of the site owned or operated by each PRP. At the time a potential environmental issue is identified, initial accruals for environmental liability are established when such liability is probable and a reasonable estimate of the associated costs can be made. Costs are estimated based on the type and level of investigation and/or remediation activities that our internal environmental staff (and where appropriate, independent consultants) have determined to be necessary to comply with applicable laws and regulations. Activities include surveys and environmental studies of potentially contaminated sites as well as costs for remediation and restoration of sites determined to be contaminated. In addition, we have provided indemnities for potential environmental liabilities to buyers of divested companies. In these instances, accruals are based on the scope and duration of the respective indemnities together with the extent of known contamination. Estimates are periodically reviewed and adjusted as required to reflect additional information about facility or site characteristics or changes in regulatory requirements. We conduct a quarterly environmental contingency analysis, which considers a combination of factors including independent consulting reports, site visits, legal reviews, analysis of the likelihood of participation in and the ability of other PRPs to pay for cleanup, and historical trend analyses. We are involved in administrative and judicial proceedings and other voluntary and mandatory cleanup efforts at 17 sites, including Superfund sites, for which we are contributing to the cost of performing the study or cleanup, or both, of alleged environmental contamination. As of December 31, 2013, we have recorded accruals of $14.7 million for remediation and restoration costs that we believe to be probable and for which the amount of loss can be reasonably estimated. These amounts are included in other liabilities on our balance sheet. Our environmental liabilities are not discounted. We did not materially change our methodology for identifying and calculating environmental liabilities in the last three years. Currently, no known trends, demands, commitments, events or uncertainties exist that are reasonably likely to occur and materially affect the methodology or assumptions described above. The recorded accruals represent our best estimate of all costs for remediation and restoration of affected sites, without reduction for anticipated recoveries from third parties, and include both asserted and unasserted claims. However, we are unable to provide a reasonable estimate of the maximum potential loss associated with these sites because cleanup costs cannot be predicted with certainty. Various factors beyond our control can impact the amount of loss GATX will ultimately incur with respect to these sites, including the extent of corrective actions that may be required; evolving environmental laws and regulations; advances in environmental technology, the extent of other parties' participation in cleanup efforts; developments in periodic environmental analyses related to sites determined to be contaminated, and developments in environmental surveys and studies of potentially contaminated sites. As a result, future charges associated with these sites could have a significant effect on results of operations in a particular quarter or year if the costs materially exceed the accrued amount as individual site studies and remediation and restoration efforts proceed. However, management believes it is unlikely that the ultimate cost to GATX for any of these sites, either individually or in the aggregate, will have a material adverse effect on our consolidated financial position or liquidity.

OTE 23. Legal Proceedings and Other Contingencies

Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against GATX and certain of our subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved or settled adversely.

Viareggio Derailment

In June 2009, a train consisting of fourteen liquefied petroleum gas (“LPG”) tank cars owned by GATX Rail Austria GmbH (an indirect subsidiary of the Company, "GATX Rail Austria") and its subsidiaries derailed while passing through the City of Viareggio, in the province of Lucca, Italy. Five tank cars overturned and one of the overturned cars was punctured by a peg or obstacle along the side of the track, resulting in a release of LPG, which subsequently ignited. Thirty-two people died and others were injured in the fire, which also resulted in property damage. The LPG tank cars were leased to FS Logistica S.p.A., a subsidiary of the Italian state-owned railway, Ferrovie dello Stato S.p.A (the “Italian Railway”).

On December 14, 2012, the Public Prosecutors of Lucca ("Public Prosecutors") formally charged GATX Rail Austria and two of its subsidiaries (collectively, "GRA"), as well as ten maintenance and supervisory employees (the "Employees"), with various negligence-based crimes related to the accident, all of which are punishable under Italian law by incarceration, damages and fines. Similar charges were brought against four Italian Railway companies and eighteen of their employees, among others. The Public Prosecutors assert that the axle on a tank car broke, causing the derailment and resulting in a tank rupture and release of LPG, after the car hit an obstacle placed on the side of the track by the Italian Railway. The Public Prosecutors further allege that a crack in the axle was detectable at the time of final inspection but was overlooked by the Employees at the Jungenthal Waggon GmbH workshop (a subsidiary of GATX Rail Austria). The trial in the Court of Lucca (the “Lucca Trial”) commenced on November 13, 2013.

With respect to civil claims, GRA’s insurers continue to work cooperatively with the insurer for the Italian Railway to adjust and settle personal injury and property damage claims. These joint settlement efforts have so far settled most of the significant civil claims related to the accident; however, approximately 90 civil claimants did not settle and are currently parties to the Lucca Trial. The Court of Lucca will determine both the civil and criminal liability of the defendants in the one proceeding. GRA believes that it and its Employees acted diligently and properly with respect to applicable legal and industry standards, but expects that its insurers will cover any civil damages if awarded to the claimants in the Lucca trial.

Since May 2012, the excess insurer providing coverage, Liberty Mutual Insurance Europe Limited (“Liberty”) has settled civil claims but has refused to reimburse GRA for its ongoing legal defense fees and costs, taking a position contrary to insurers in the prior underlying layers who had provided coverage for such expenses. To date, GRA has incurred approximately $5.0 million in unreimbursed defense fees and costs at the Liberty coverage layer and continues to incur costs in connection with the Lucca Trial. Consequently, in October 2013, GRA filed an arbitration proceeding against Liberty seeking to recoup its unreimbursed defense fees and costs (the “Liberty Arbitration”). The Liberty excess layer is currently fully exhausted and, therefore, the issue of reimbursement for outstanding defense costs will now be determined by the four insurers in the next coverage layer, which includes 25% held by Liberty. GRA cannot predict the outcome of the Liberty Arbitration, the amount of defense fees and costs that ultimately may not be reimbursed by Liberty, or the positions other excess insurers in the current coverage layer may take with respect to defense fees and costs.

GATX cannot predict the outcome of the Lucca Trial or what other legal proceedings or claims, if any, may be initiated against GRA or its personnel, and, therefore, cannot reasonably estimate the possible amount or range of loss that may ultimately be incurred in connection with this accident. Accordingly, we have not established any accruals with respect to this matter.

Other Litigation

GATX and its subsidiaries have been named as defendants in various other legal actions and claims, governmental proceedings and private civil suits arising in the ordinary course of business, including environmental matters, workers’ compensation claims and other personal injury claims. Some of these proceedings include claims for punitive as well as compensatory damages.

Several of our subsidiaries have also been named as defendants or co-defendants in cases alleging injury caused by exposure to asbestos. The plaintiffs seek an unspecified amount of damages based on common law, statutory or premises liability or, in the case of ASC, the Jones Act, which provides limited remedies to certain maritime employees. As of January 31, 2014, there were 140 asbestos-related cases pending against GATX and its subsidiaries. Of the total number of pending cases, 116 are Jones Act claims, most of which were filed against ASC before the year 2000. During 2013, 10 new cases were filed, and 61 cases were dismissed without payment or otherwise settled for an immaterial amount. In addition, demand has been made against GATX for asbestos-related claims under limited indemnities given in connection with the sale of certain of our former subsidiaries. It is possible that the number of these cases or claims for indemnity could begin to grow and that the cost of these cases, including costs to defend, could correspondingly increase in the future.

Litigation Accruals

We have recorded accruals totaling $1.9 million at December 31, 2013, for losses related to those litigation matters that we believe to be probable and for which an amount of loss can be reasonably estimated. However, we cannot determine a reasonable estimate of the maximum possible loss or range of loss for these matters given that they are at various stages of the litigation process and each case is subject to the inherent uncertainties of litigation (such as the strength of our legal defenses and the availability of insurance recovery). Although the maximum amount of liability that may ultimately result from any of these matters cannot be predicted with absolute certainty, management expects that none of the matters for which we have recorded an accrual, when ultimately resolved, will have a material adverse effect on our consolidated financial position or liquidity. It is possible, however, that the ultimate resolution of one or more of these matters could have a material adverse effect on our results of operations in a particular quarter or year if such resolution results in liability that materially exceeds the accrued amount.

In addition, other litigation matters are pending for which we have not recorded any accruals because our potential liability for those matters is not probable or cannot be reasonably estimated based on currently available information. For those matters where we have not recorded an accrual but a loss is reasonably possible, we cannot determine a reasonable estimate of the maximum possible loss or range of loss for these matters given that they are at various stages of the litigation process and each case is subject to the inherent uncertainties of litigation (such as the strength of our legal defenses and the availability of insurance recovery). Although the maximum amount of liability that may ultimately result from any of these matters cannot be predicted with absolute certainty, management expects that none of the matters for which we have not recorded an accrual, when ultimately resolved, will have a material adverse effect on our consolidated financial position or liquidity. It is possible, however, that the ultimate resolution of one or more of these matters could have a material adverse effect on our results of operations in a particular quarter or year if such resolution results in a significant liability for GATX.

Environmental

Our operations are subject to extensive federal, state and local environmental regulations. Our operating procedures include practices to protect the environment from the risks inherent in full service railcar leasing, which involves maintaining railcars used by customers to transport chemicals and other hazardous materials. Additionally, some of our real estate holdings, including previously owned properties, are or have been used for industrial or transportation-related purposes or leased to commercial or industrial companies whose activities might have resulted in discharges on the property. As a result, we are subject to environmental cleanup and enforcement actions. In particular, the federal Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), also known as the Superfund law, as well as similar state laws, impose joint and several liability for cleanup and enforcement costs on current and former owners and operators of a site without regard to fault or the legality of the original conduct. If there are other potentially responsible parties (“PRPs”), we generally contribute to the cleanup of these sites through cost-sharing agreements with terms that vary from site to site. Costs are typically allocated based on the relative volumetric contribution of material, the period of time the site was owned or operated, and/or the portion of the site owned or operated by each PRP.

At the time a potential environmental issue is identified, initial accruals for environmental liability are established when such liability is probable and a reasonable estimate of the associated costs can be made. Costs are estimated based on the type and level of investigation and/or remediation activities that our internal environmental staff (and where appropriate, independent consultants) have determined to be necessary to comply with applicable laws and regulations. Activities include surveys and environmental studies of potentially contaminated sites as well as costs for remediation and restoration of sites determined to be contaminated. In addition, we have provided indemnities for potential environmental liabilities to buyers of divested companies. In these instances, accruals are based on the scope and duration of the respective indemnities together with the extent of known contamination. Estimates are periodically reviewed and adjusted as required to reflect additional information about facility or site characteristics or changes in regulatory requirements. We conduct a quarterly environmental contingency analysis, which considers a combination of factors including independent consulting reports, site visits, legal reviews, analysis of the likelihood of participation in and the ability of other PRPs to pay for cleanup, and historical trend analyses.

We are involved in administrative and judicial proceedings and other voluntary and mandatory cleanup efforts at 17 sites, including Superfund sites, for which we are contributing to the cost of performing the study or cleanup, or both, of alleged environmental contamination. As of December 31, 2013, we have recorded accruals of $14.7 million for remediation and restoration costs that we believe to be probable and for which the amount of loss can be reasonably estimated. These amounts are included in other liabilities on our balance sheet. Our environmental liabilities are not discounted.

We did not materially change our methodology for identifying and calculating environmental liabilities in the last three years. Currently, no known trends, demands, commitments, events or uncertainties exist that are reasonably likely to occur and materially affect the methodology or assumptions described above.

The recorded accruals represent our best estimate of all costs for remediation and restoration of affected sites, without reduction for anticipated recoveries from third parties, and include both asserted and unasserted claims. However, we are unable to provide a reasonable estimate of the maximum potential loss associated with these sites because cleanup costs cannot be predicted with certainty. Various factors beyond our control can impact the amount of loss GATX will ultimately incur with respect to these sites, including the extent of corrective actions that may be required; evolving environmental laws and regulations; advances in environmental technology, the extent of other parties' participation in cleanup efforts; developments in periodic environmental analyses related to sites determined to be contaminated, and developments in environmental surveys and studies of potentially contaminated sites. As a result, future charges associated with these sites could have a significant effect on results of operations in a particular quarter or year if the costs materially exceed the accrued amount as individual site studies and remediation and restoration efforts proceed. However, management believes it is unlikely that the ultimate cost to GATX for any of these sites, either individually or in the aggregate, will have a material adverse effect on our consolidated financial position or liquidity.