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v2.4.1.9

Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, Percent | 32.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 41.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 18.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
GATX income taxes on sale of AAE | $ 0 gmt_TaxOnGainOfAffiliateSale | $ 23.2 gmt_TaxOnGainOfAffiliateSale | $ 0 gmt_TaxOnGainOfAffiliateSale
Deferred Tax Liabilities |  |  |
Book/tax basis difference due to depreciation | 963.8 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 852.0 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Investments in affiliated companies | 99.7 us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates | 93.7 us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates |
Lease accounting (other than leveraged) | 10.5 us-gaap_DeferredTaxLiabilitiesLeasingArrangements | 24.4 us-gaap_DeferredTaxLiabilitiesLeasingArrangements |
Other | 0.1 us-gaap_DeferredTaxLiabilitiesOther | 0 us-gaap_DeferredTaxLiabilitiesOther |
Total deferred tax liabilities | 1,074.1 us-gaap_DeferredIncomeTaxLiabilities | 970.1 us-gaap_DeferredIncomeTaxLiabilities |
Deferred Tax Assets |  |  |
Alternative minimum tax credit | 9.2 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 8.4 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |
Federal net operating loss | 41.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 8.9 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |
Foreign tax credit | 3.6 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 3.6 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Valuation on foreign tax credit | (3.6)us-gaap_TaxCreditCarryforwardValuationAllowance | (3.6)us-gaap_TaxCreditCarryforwardValuationAllowance |
State net operating loss | 28.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 27.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |
Valuation on state net operating loss | (11.3)gmt_DeferredTaxAssetsValuationOnStateNetOperatingLoss | (11.2)gmt_DeferredTaxAssetsValuationOnStateNetOperatingLoss |
Foreign net operating loss | 5.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign | 8.5 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |
Deferred Tax Assets, Valuation Allowance | (0.2)us-gaap_DeferredTaxAssetsValuationAllowance | (0.2)us-gaap_DeferredTaxAssetsValuationAllowance |
Accruals not currently deductible for tax purposes | 18.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 14.1 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |
Allowance for losses | 1.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 2.2 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts |
Pension and post-retirement benefits | 32.6 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 13.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits |
Other | 9.8 us-gaap_DeferredTaxAssetsOther | 7.6 us-gaap_DeferredTaxAssetsOther |
Total deferred tax assets | 136.8 us-gaap_DeferredTaxAssetsGross | 78.7 us-gaap_DeferredTaxAssetsGross |
Net deferred tax liabilities | 937.3 us-gaap_DeferredTaxLiabilities | 891.4 us-gaap_DeferredTaxLiabilities |
Gross liability for unrecognized tax benefits |  |  |
Beginning balance | 5.7 us-gaap_UnrecognizedTaxBenefits | 4.7 us-gaap_UnrecognizedTaxBenefits |
Reductions due to expiration of the applicable statute of limitations | 0.4 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |
Reductions due to settlement of audit issues | (0.3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (1.0)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |
Ending balance | 5.6 us-gaap_UnrecognizedTaxBenefits | 5.7 us-gaap_UnrecognizedTaxBenefits | 4.7 us-gaap_UnrecognizedTaxBenefits
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount | 0 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | 3.9 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | 13.7 us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Expiration of the applicable statute of limitations | 0.2 us-gaap_IncomeTaxReconciliationTaxContingenciesDomestic | (0.6)us-gaap_IncomeTaxReconciliationTaxContingenciesDomestic | 15.5 us-gaap_IncomeTaxReconciliationTaxContingenciesDomestic
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | $ 0 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | $ 0 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | $ 6.3 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in domestic income tax contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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