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v2.4.1.9

Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of reasons for difference between GATX's effective income tax rate and federal statutory income tax |  |  |
Income taxes at federal statutory rate | $ 80.9 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 55.6 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 50.4 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Adjust for effect of: |  |  |
GATX income taxes on sale of AAE | 0 gmt_TaxOnGainOfAffiliateSale | 23.2 gmt_TaxOnGainOfAffiliateSale | 0 gmt_TaxOnGainOfAffiliateSale
Foreign tax credits | 0 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | (3.9)us-gaap_IncomeTaxReconciliationTaxCreditsForeign | (13.7)us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Foreign earnings taxed at lower rates | (8.5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (10.3)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (4.1)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Tax effect of foreign dividends | 0 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | 0 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | 6.3 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Expiration of the applicable statute of limitations | 0 us-gaap_IncomeTaxReconciliationDeductionsOther | 0 us-gaap_IncomeTaxReconciliationDeductionsOther | (15.5)us-gaap_IncomeTaxReconciliationDeductionsOther
Corporate owned life insurance | (0.6)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (0.5)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (0.3)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
State income taxes | 4.1 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1.5 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1.9 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other | (0.2)us-gaap_IncomeTaxReconciliationOtherAdjustments | (0.1)us-gaap_IncomeTaxReconciliationOtherAdjustments | 1.1 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income taxes | $ 75.7 us-gaap_IncomeTaxExpenseBenefit | $ 65.5 us-gaap_IncomeTaxExpenseBenefit | $ 26.1 us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate | 32.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 41.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 18.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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