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Schedule I - Condensed Financial Information of Registrant - Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Activities |  |  |
Net cash provided by operating activities | $ 449.2 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 400.7 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 370.2 us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities |  |  |
Purchases of leased-in assets | (150.5)gmt_PurchasesOfLeasedInAssets | (61.4)gmt_PurchasesOfLeasedInAssets | (1.3)gmt_PurchasesOfLeasedInAssets
Proceeds from sale-leasebacks | 0 us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities | 90.7 us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities | 104.9 us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities
Portfolio proceeds and other | 264.0 gmt_PortfolioProceeds | 385.3 gmt_PortfolioProceeds | 288.9 gmt_PortfolioProceeds
Net cash used in investing activities | (878.5)us-gaap_NetCashProvidedByUsedInInvestingActivities | (403.2)us-gaap_NetCashProvidedByUsedInInvestingActivities | (343.6)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities |  |  |
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 us-gaap_ProceedsFromRepaymentsOfShortTermDebt | (251.3)us-gaap_ProceedsFromRepaymentsOfShortTermDebt | 243.3 us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Proceeds from issuances of debt (original maturities longer than 90 days) | 1,223.0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 1,132.2 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 445.2 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Stock repurchases | (124.6)us-gaap_PaymentsForRepurchaseOfCommonStock | (68.6)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends | (62.0)us-gaap_PaymentsOfDividends | (60.5)us-gaap_PaymentsOfDividends | (58.8)us-gaap_PaymentsOfDividends
Net cash (used in) provided by financing activities | 262.2 us-gaap_NetCashProvidedByUsedInFinancingActivities | 149.1 us-gaap_NetCashProvidedByUsedInFinancingActivities | (39.9)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents during the period | (169.8)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 145.5 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (14.2)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at beginning of period | 379.7 us-gaap_CashAndCashEquivalentsAtCarryingValue | 234.2 us-gaap_CashAndCashEquivalentsAtCarryingValue | 248.4 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at end of period | 209.9 us-gaap_CashAndCashEquivalentsAtCarryingValue | 379.7 us-gaap_CashAndCashEquivalentsAtCarryingValue | 234.2 us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member] |  |  |
Operating Activities |  |  |
Net cash provided by operating activities | 219.5 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 104.3 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 269.6 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investing Activities |  |  |
Capital additions | 748.1 us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 513.5 us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 444.6 us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of leased-in assets | (150.5)gmt_PurchasesOfLeasedInAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (61.4)gmt_PurchasesOfLeasedInAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1.4)gmt_PurchasesOfLeasedInAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from sale-leasebacks | 0 us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 90.7 us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 104.9 us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Portfolio proceeds and other | 169.5 gmt_PortfolioProceeds / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 320.7 gmt_PortfolioProceeds / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 136.6 gmt_PortfolioProceeds / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in investing activities | (729.1)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (163.5)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (204.5)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Financing Activities |  |  |
Repayments of debt (original maturities longer than 90 days) | (692.2)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (483.8)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (603.7)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in debt with original maturities of 90 days or less | 69.0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (185.0)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 185.0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from issuances of debt (original maturities longer than 90 days) | 1,188.7 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 967.0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 381.4 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock repurchases | (124.6)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (68.6)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends | (62.0)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (60.5)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (57.7)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | (1.6)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5.0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash (used in) provided by financing activities | 377.3 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 170.3 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (90.0)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net (decrease) increase in cash and cash equivalents during the period | (132.3)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 111.1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (24.9)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and Cash Equivalents at beginning of period | 294.6 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 183.5 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 208.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and Cash Equivalents at end of period | $ 162.3 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 294.6 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 183.5 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + 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 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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