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v2.4.1.9

Supplemental Cash Flow and Noncash Investing Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Car | Dec. 31, 2013 Vessel Car | Dec. 31, 2012
Noncash or Part Noncash Divestitures [Line Items] |  |  |  |
Number of railcars received | 62 gmt_Numberofrailcarsreceived |  | 640 gmt_Numberofrailcarsreceived |
Number of vessels received |  |  | 5 gmt_Numberofvesselsreceived |
Noncash or Part Noncash Acquisition, Value of Assets Acquired | $ 1.1 us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 |  | $ 174.7 us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 |
Fair Value of Assets Acquired | 1.1 us-gaap_FairValueOfAssetsAcquired |  | 22.9 us-gaap_FairValueOfAssetsAcquired | 0 us-gaap_FairValueOfAssetsAcquired
Supplemental Cash Flow Information |  |  |  |
Interest paid | 142.6 us-gaap_InterestPaid | [1] | 148.7 us-gaap_InterestPaid | 162.3 us-gaap_InterestPaid
Income taxes paid (refunded), net | 18.7 us-gaap_IncomeTaxesPaidNet |  | 7.4 us-gaap_IncomeTaxesPaidNet | 11.1 us-gaap_IncomeTaxesPaidNet
Portfolio proceeds | $ 264.0 gmt_PortfolioProceeds |  | $ 385.3 gmt_PortfolioProceeds | $ 288.9 gmt_PortfolioProceeds
[1] | (1) Interest paid consisted of interest on debt obligations, interest rate swaps (net of interest received), and capital leases. The interest expense we capitalized as part of the cost of construction of major assets was immaterial for all periods presented.

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- Definition The fair value of assets acquired in noncash 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 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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