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Leases (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Corporations
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Schedule of Capital Leased Assets [Table Text Block]
The following table shows assets we financed with capital lease obligations as of December 31 (in millions):
 
2014
 
2013
Marine vessels
$
83.1

 
$
81.4

Less: allowance for depreciation
(75.3
)
 
(71.4
)
 
$
7.8

 
$
10.0

    
Operating Leases, Rent Expense $ 112.9us-gaap_LeaseAndRentalExpense $ 134.0us-gaap_LeaseAndRentalExpense $ 133.3us-gaap_LeaseAndRentalExpense
Leases (Textual) [Abstract]      
Income from leveraged leases, net of taxes     0.2us-gaap_LeveragedLeasesIncomeStatementNetIncomeFromLeveragedLeases
Rental income from usage rents 83.9us-gaap_OperatingLeasesIncomeStatementContingentRevenue 21.3us-gaap_OperatingLeasesIncomeStatementContingentRevenue 18.2us-gaap_OperatingLeasesIncomeStatementContingentRevenue
Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [Table Text Block] 18500    
Deferred initial direct costs of direct financial leases $ 0.3us-gaap_DeferredCostsLeasingGross $ 0.4us-gaap_DeferredCostsLeasingGross  
Number of corporations 1gmt_NumberOfCorporations    
Railroad Transportation Equipment [Member]      
Operating Leased Assets [Line Items]      
Schedule of Capital Leased Assets [Table Text Block] 23000    
Marine vessels [Member]      
Operating Leased Assets [Line Items]      
Schedule of Capital Leased Assets [Table Text Block] 1