Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and Cash Equivalents	$ 351.4	$ 209.9
Restricted Cash	15.6	14.5
Receivables
Rent and other receivables	64.1us-gaap_AccountsReceivableGrossCurrent	86.0us-gaap_AccountsReceivableGrossCurrent
Loans	13.4gmt_LoansReceivablesGrossCarryingAmount	97.3gmt_LoansReceivablesGrossCarryingAmount
Finance leases	175.4	174.7
Less: allowance for losses	(5.6)	(5.7)
Receivables, net	247.3	352.3
Operating Assets and Facilities
Operating Assets and Facilities ($123.1 and $123.1 related to a consolidated VIE)	8,194.2us-gaap_PropertyPlantAndEquipmentGross	8,143.5us-gaap_PropertyPlantAndEquipmentGross
Less: allowance for depreciation ($36.2 and $35.0 related to a consolidated VIE)	(2,434.9)	(2,455.5)
Operating assets and facilities, net	5,759.3us-gaap_PropertyPlantAndEquipmentNet	5,688.0us-gaap_PropertyPlantAndEquipmentNet
Investments in Affiliated Companies	359.7	357.7
Goodwill	79.1us-gaap_Goodwill	86.1us-gaap_Goodwill
Other Assets	244.0us-gaap_OtherAssets	229.0us-gaap_OtherAssets
Total Assets	7,056.4us-gaap_Assets	6,937.5us-gaap_Assets
Liabilities and Shareholders’ Equity
Accounts Payable and Accrued Expenses	163.8	165.9
Debt
Commercial paper and borrowings under bank credit facilities	2.8us-gaap_OtherShortTermBorrowings	72.1us-gaap_OtherShortTermBorrowings
Recourse	4,443.8gmt_RecourseDebt	4,179.9gmt_RecourseDebt
Nonrecourse ($13.7 and $15.9 related to a consolidated VIE)	(13.7)us-gaap_NonRecourseDebt	(15.9)us-gaap_NonRecourseDebt
Capital lease obligations	5.0	6.3
Total Debt	4,465.3us-gaap_DebtAndCapitalLeaseObligations	4,274.2us-gaap_DebtAndCapitalLeaseObligations
Deferred Income Taxes	952.1us-gaap_DeferredTaxLiabilities	937.3us-gaap_DeferredTaxLiabilities
Other Liabilities	192.7us-gaap_OtherLiabilities	246.1us-gaap_OtherLiabilities
Total Liabilities	5,773.9us-gaap_Liabilities	5,623.5us-gaap_Liabilities
Shareholders’ Equity
Common stock, $0.625 par value: Authorized shares — 120,000,000 Issued shares — 66,724,418 and 66,600,984 Outstanding shares — 43,900,464 and 44,198,850	(41.5)us-gaap_CommonStockValue	(41.4)us-gaap_CommonStockValue
Additional paid in capital	(671.2)us-gaap_AdditionalPaidInCapital	(672.8)us-gaap_AdditionalPaidInCapital
Retained earnings	1,547.2	1,501.7
Accumulated other comprehensive loss	196.9	148.4
Treasury stock at cost (22,823,954 and 22,402,134 shares)	(780.5)us-gaap_TreasuryStockValue	(753.5)us-gaap_TreasuryStockValue
Total Shareholders’ Equity	1,282.5us-gaap_StockholdersEquity	1,314.0us-gaap_StockholdersEquity
Total Liabilities and Shareholders’ Equity	$ 7,056.4	$ 6,937.5

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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