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Leases (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Capital Leases    
2013, Capital Leases $ 3.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent  
2014, Capital Leases 2.7us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
2015, Capital Leases 1.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
2016, Capital Leases 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears  
2017, Capital Leases 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears  
Years thereafter, Capital Leases 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter  
Capital Leases, Future Minimum Payments Due, Total 6.9us-gaap_CapitalLeasesFutureMinimumPaymentsDue  
Less: amounts representing interest (0.6)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments  
Present value of future minimum capital lease payments 6.3us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments 8.9us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Recourse Operating Leases [Member]    
Operating Leases    
2013, Operating Lease 86.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
2014, Operating Lease 89.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
2015, Operating Lease 94.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
2016, Operating Lease 85.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
2017, Operating Lease 81.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
Years thereafter, Operating Leases 310.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
Total, Operating Leases 746.7us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ gmt_OperatingLeasesByTypeAxis
= gmt_RecourseOperatingLeasesMember		  
Nonrecourse Operating Leases [Member]    
Operating Leases    
2013, Operating Lease 11.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
2014, Operating Lease 8.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
2015, Operating Lease 9.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
2016, Operating Lease 9.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
2017, Operating Lease 9.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
Years thereafter, Operating Leases 18.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
Total, Operating Leases $ 66.0us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ gmt_OperatingLeasesByTypeAxis
= gmt_NonrecourseOperatingLeasesMember		 [1]  
[1] (1) The amounts shown are primarily the rental payments of one wholly owned, bankruptcy-remote special purpose corporations. We consolidate these rentals for accounting purposes, but they are not our legal obligations.