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Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summarized details of swaps outstanding and the related hedged items    
Aggregate notional amount of interest rate swaps   400,000invest_DerivativeNotionalAmount
Interest Rate Swaps Maturing March 2015 [Member]    
Summarized details of swaps outstanding and the related hedged items    
Issuance date Feb. 24, 2011  
Maturity date Mar. 02, 2015  
Face value of medium - term notes 350,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingMarchTwoThousandFifteenMember		  
Aggregate notional amount of interest rate swaps 150,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingMarchTwoThousandFifteenMember		  
Fixed interest rate 3.15%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingMarchTwoThousandFifteenMember		  
Weighted-average variable interest rate on hedged debt 1.28%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingMarchTwoThousandFifteenMember		 1.34%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingMarchTwoThousandFifteenMember
Interest Rate Swaps Maturing June 2017 [Member]    
Summarized details of swaps outstanding and the related hedged items    
Issuance date May 24, 2011  
Maturity date Jun. 01, 2017  
Face value of medium - term notes 350,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandSeventeenMember		  
Aggregate notional amount of interest rate swaps 150,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandSeventeenMember		  
Fixed interest rate 3.50%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandSeventeenMember		  
Weighted-average variable interest rate on hedged debt 1.42%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandSeventeenMember		 1.44%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandSeventeenMember
Interest Rate Swaps Maturing November 2018 [Member]    
Summarized details of swaps outstanding and the related hedged items    
Issuance date Nov. 12, 2013  
Maturity date Nov. 15, 2018  
Face value of medium - term notes 300,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingNovemberTwoThousandEighteenMember		  
Aggregate notional amount of interest rate swaps 100,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingNovemberTwoThousandEighteenMember		  
Fixed interest rate 2.45%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingNovemberTwoThousandEighteenMember		  
Weighted-average variable interest rate on hedged debt 1.19%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingNovemberTwoThousandEighteenMember		 1.19%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingNovemberTwoThousandEighteenMember
Interest Rate Swaps Maturing June 2019 [Member]    
Summarized details of swaps outstanding and the related hedged items    
Issuance date Feb. 25, 2014  
Maturity date Jun. 01, 2019  
Face value of medium - term notes 350,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandNineteenMember		  
Aggregate notional amount of interest rate swaps 100,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandNineteenMember		  
Fixed interest rate 2.55%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandNineteenMember		  
Weighted-average variable interest rate on hedged debt 1.10%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandNineteenMember		 0.00%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingJuneTwoThousandNineteenMember
Interest Rate Swaps Maturing September 2019 [Member]    
Summarized details of swaps outstanding and the related hedged items    
Issuance date May 06, 2014  
Maturity date Sep. 03, 2019  
Face value of medium - term notes 400,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingSeptemberTwoThousandNineteenMemberDomain		  
Aggregate notional amount of interest rate swaps $ 100,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingSeptemberTwoThousandNineteenMemberDomain		  
Fixed interest rate 2.45%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingSeptemberTwoThousandNineteenMemberDomain		  
Weighted-average variable interest rate on hedged debt 0.86%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingSeptemberTwoThousandNineteenMemberDomain		 0.00%r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
/ us-gaap_DerivativeInstrumentRiskAxis
= r_InterestRateSwapsMaturingSeptemberTwoThousandNineteenMemberDomain