Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 205.0us-gaap_NetIncomeLoss	$ 169.3us-gaap_NetIncomeLoss	$ 137.3us-gaap_NetIncomeLoss
Adjustments to reconcile income to net cash provided by operating activities:
Gains on sales of assets	(79.3)us-gaap_GainLossOnDispositionOfAssets	(80.7)us-gaap_GainLossOnDispositionOfAssets	(61.4)us-gaap_GainLossOnDispositionOfAssets
Depreciation	287.0us-gaap_Depreciation	267.8us-gaap_Depreciation	249.4us-gaap_Depreciation
Share-based Compensation	14.0us-gaap_ShareBasedCompensation	13.1us-gaap_ShareBasedCompensation	12.2us-gaap_ShareBasedCompensation
Asset impairment charges	1.3us-gaap_AssetImpairmentCharges	5.9us-gaap_AssetImpairmentCharges	5.0us-gaap_AssetImpairmentCharges
Deferred income taxes	61.4us-gaap_DeferredIncomeTaxExpenseBenefit	53.6us-gaap_DeferredIncomeTaxExpenseBenefit	24.4us-gaap_DeferredIncomeTaxExpenseBenefit
Share of affiliates’ earnings, net of dividends	(9.5)	(41.4)	15.5
Change in income taxes payable	(4.4)	4.5	(9.4)
Change in accrued operating lease expense	(5.2)	(7.7)	(11.0)
Employee benefit plans	3.7	7.5	0.8
Other	(24.8)us-gaap_OtherNoncashIncomeExpense	8.8us-gaap_OtherNoncashIncomeExpense	7.4us-gaap_OtherNoncashIncomeExpense
Net cash provided by operating activities	449.2	400.7	370.2
Investing Activities
Additions to operating assets and facilities	(1,015.2)	(744.1)	(739.3)
Loans extended	0	(14.2)	(1.0)
Investments in affiliates	(15.3)	(101.3)	(29.7)
Portfolio investments and capital additions	(1,030.5)	(859.6)	(770.0)
Purchases of leased-in assets	(150.5)gmt_PurchasesOfLeasedInAssets	(61.4)gmt_PurchasesOfLeasedInAssets	(1.3)gmt_PurchasesOfLeasedInAssets
Portfolio proceeds	264.0gmt_PortfolioProceeds	385.3gmt_PortfolioProceeds	288.9gmt_PortfolioProceeds
Proceeds from sales of other assets	26.9	32.3	28.4
Proceeds from sale-leasebacks	0	90.7	104.9
Net decrease (increase) in restricted cash	5.8	9.5	5.5
Payments for (Proceeds from) Other Investing Activities	5.8	0	0
Net cash used in investing activities	(878.5)	(403.2)	(343.6)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	1,223.0	1,132.2	445.2
Repayments of debt (original maturities longer than 90 days)	(819.8)us-gaap_RepaymentsOfLongTermDebt	(602.8)us-gaap_RepaymentsOfLongTermDebt	(671.2)us-gaap_RepaymentsOfLongTermDebt
Net increase (decrease) in debt with original maturities of 90 days or less	50.0	(251.3)	243.3
Payments on capital lease obligations	(2.6)	(2.4)	(3.0)
Stock repurchases	(124.6)	(68.6)	0
Dividends	(62.0)us-gaap_PaymentsOfDividends	(60.5)us-gaap_PaymentsOfDividends	(58.8)us-gaap_PaymentsOfDividends
Other	(1.8)	2.5	4.6
Net cash (used in) provided by financing activities	262.2	149.1	(39.9)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(2.7)	(1.1)	(0.9)
Net (decrease) increase in Cash and Cash Equivalents during the period	(169.8)	145.5	(14.2)
Cash and Cash Equivalents at beginning of period	379.7	234.2	248.4
Cash and Cash Equivalents at end of period	$ 209.9	$ 379.7	$ 234.2

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6513228

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy.

+ References

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

Amount of cash inflow after closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757

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-Topic 840

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-Topic 840

-SubTopic 40

-Section 55

-Paragraph 52

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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