XML 101 R39.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Variable Interest Entities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract] |
Carrying amounts of assets and liabilities of consolidated VIE | The following table shows the carrying amounts of assets and liabilities of the consolidated variable interest entity as of December 31 (in millions):
| 2014 |  | 2013
Operating assets, net of accumulated depreciation (1) | $ | 88.1 |  |  | $ | 93.0 |
Nonrecourse debt | 15.9 |  |  | 25.4 |
_________
(1) | All operating assets are pledged as collateral on the nonrecourse debt.
Carrying amounts and maximum exposure to loss for non consolidated VIEs | The following table shows the carrying amounts and maximum exposure to loss for our unconsolidated variable interest entities as of December 31 (in millions):
| 2014 |  | 2013
| Net Carrying Amount |  | Maximum Exposure to Loss |  | Net Carrying Amount |  | Maximum Exposure to Loss
Investments in affiliates | $ | 143.9 |  |  | $ | 143.9 |  |  | $ | 125.5 |  |  | $ | 125.5 |
Other investment | 0.4 |  |  | 0.4 |  |  | 0.6 |  |  | 0.6 |
Total | $ | 144.3 |  |  | $ | 144.3 |  |  | $ | 126.1 |  |  | $ | 126.1 |

X
- Definition Carrying amounts and maximum exposure to loss with respect to VIEs. + References No definition available. + Details
Name: | gmt_VariableInterestCarryingAmountsAndMaximumExposureToLossWithRespectToViesTableTextBlock
Namespace Prefix: | gmt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Variable interest entity carrying amount of assets and liabilities. + References No definition available. + Details
Name: | gmt_VariableInterestEntityCarryingAmountOfAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | gmt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_VariableInterestEntityNotPrimaryBeneficiaryDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration