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Leases (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Direct Financing [Abstract]    
Total minimum lease payments receivable, Direct Financing $ 204.8us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived $ 270.2us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived
Estimated non-guaranteed residual value of leased assets, Direct Financing 68.5us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty 79.8us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty
Unearned income, Direct Financing (98.6)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome (142.7)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome
Finance leases, Direct Financing $ 174.7gmt_DirectFinancingLeasesNetInvestmentInDirectFinancingLeasesDisclosureFinanceLeaseNetOfUnearnedIncome $ 207.3gmt_DirectFinancingLeasesNetInvestmentInDirectFinancingLeasesDisclosureFinanceLeaseNetOfUnearnedIncome