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Investments in Affiliated Companies (Future Debt Maturities) (Details 8) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
2015 $ 529.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 639.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 455.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 507.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 592.3us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 1,480.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total debt principal 4,203.8us-gaap_LongTermDebt 3,842.0us-gaap_LongTermDebt
RRPF Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
2015 277.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
 
2016 323.3us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
 
2017 252.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
 
2018 106.9us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
 
2019 426.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
 
Thereafter 904.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
 
Total debt principal $ 2,289.9us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gmt_RrpfJointVenturesMember
[1]  
[1] (1) All debt obligations are nonrecourse to the shareholders