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Other Assets and Other Liabilities (Details 1) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Components of Other Liabilities reported on the consolidated balance sheets |  |
Accrued operating lease expense | $ 43.4 gmt_AccruedOperatingLeaseExpenseCurrentAndNonCurrent | $ 48.6 gmt_AccruedOperatingLeaseExpenseCurrentAndNonCurrent
Pension and other post-retirement liabilities | 86.6 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent | 68.2 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
Deferred gains on sale-leasebacks | 49.0 us-gaap_SaleLeasebackTransactionDeferredGainNet | 53.3 us-gaap_SaleLeasebackTransactionDeferredGainNet
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 3.6 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 3.9 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Environmental reserves | 13.8 us-gaap_AccrualForEnvironmentalLossContingencies | 14.7 us-gaap_AccrualForEnvironmentalLossContingencies
Deferred income | 5.6 us-gaap_DeferredRevenue | 6.7 us-gaap_DeferredRevenue
Derivatives | 7.5 us-gaap_DerivativeLiabilities | 3.6 us-gaap_DerivativeLiabilities
Other Liabilities, Noncurrent | 36.6 us-gaap_OtherLiabilitiesNoncurrent | 31.6 us-gaap_OtherLiabilitiesNoncurrent
Total | $ 246.1 us-gaap_OtherLiabilities | $ 230.6 us-gaap_OtherLiabilities

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- 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
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