Debt (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Short-term debt and current portion of long-term debt:
Short-term debt, weighted-average interest rate	1.77%	1.30%
Short-term debt	$ 2,550,000us-gaap_ShortTermBorrowings	$ 3,773,000us-gaap_ShortTermBorrowings
Current portion of long-term debt, including capital leases	8,867,000	8,434,000
Short-term debt and current portion of long-term debt	11,417,000us-gaap_DebtCurrent	12,207,000us-gaap_DebtCurrent
Long-term debt:
U.S. commercial paper	504,100,000us-gaap_CommercialPaperNoncurrent	276,694,000us-gaap_CommercialPaperNoncurrent
Total before fair market value adjustment	4,691,485,000r_LongTermDebtAndCapitalLeaseObligation	4,503,879,000r_LongTermDebtAndCapitalLeaseObligation
Fair market value adjustment on notes subject to hedging	9,885,000r_FairMarketValueAdjustmentOnNotes	4,830,000r_FairMarketValueAdjustmentOnNotes
Total after fair market value adjustment	4,701,370,000	4,508,709,000
Current portion of long-term debt, including capital leases	(8,867,000)	(8,434,000)
Long-term debt	4,692,503,000	4,500,275,000
Total debt	4,703,920,000us-gaap_DebtAndCapitalLeaseObligations	4,512,482,000us-gaap_DebtAndCapitalLeaseObligations
Unamortized original issue discounts	7,700,000	7,900,000
Aggregate notional amount of interest rate swaps	600,000,000invest_DerivativeNotionalAmount	600,000,000invest_DerivativeNotionalAmount
U.S Commercial Paper, Long-Term [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	0.46%	0.35%
U.S. commercial paper	481,410,000	276,694,000
Global Revolving Credit Facility [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	2.67%	1.60%
Global revolving credit facility	22,710,000	11,190,000
Unsecured U.S. notes - Medium-term notes, Long-Term [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	3.25%	3.29%
Unsecured U.S. notes - Medium-term notes	3,822,369,000	3,772,159,000
Unsecured U.S. obligations, principally bank term loans, Long-Term [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	1.49%	0.76%
Unsecured U.S. obligations	50,000,000	110,500,000
Unsecured Foreign Obligations, Long-Term [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	1.92%	2.01%
Unsecured foreign obligations	279,992,000	295,776,000
Capital Lease Obligations, Long-Term [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	3.57%	3.65%
Capital lease obligations	$ 35,004,000	$ 37,560,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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