Debt - LT Debt (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 2,226,132	$ 1,587,478
Accounts receivable, net	5,769,759	4,923,898
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	443,878
Long-term Debt, Maturities, Repayments of Principal in Year Two	261,400
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,395
Long-term Debt, Maturities, Repayments of Principal in Year Four	229
Long-term Debt, Maturities, Repayments of Principal in Year Five	497,791
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,045,317
Net proceeds from note offering	591,156	0	0
Redemption of senior notes	(338,184)	0	(19,324)
Gains (Losses) on Extinguishment of Debt	(4,277)		(895)
Loss on prepayment of debt, net of tax	(2,627)		(549)
Extinguishment of Debt Gain Loss Net of Tax Per Share Basic	$ 0.03
Repayments of Bank Debt	0	0	200,000
Investment Income, Interest and Dividend	5,632	5,779	6,113
Interest Paid	116,663	113,628	104,340
Asset securitization program [Member]
Debt Instrument [Line Items]
Long-term debt	420,000	225,000
Debt Instrument, Interest Rate, Effective Percentage	0.61%
Asset securitization program	775,000
Asset Securitization Program Interest Rate Spread At End of Period	0.40%
Asset Securitization Program Facility Fee	0.40%
Accounts receivable, net	1,867,552	1,610,946
3.375% notes, due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt	255,004	257,732
Debt Instrument, Fair Value	260,000	260,000
Debt Instrument, Interest Rate, Stated Percentage	3.375%
6.875% senior debentures, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	199,078	198,869
Debt Instrument, Fair Value	228,000	236,000
Debt Instrument, Interest Rate, Stated Percentage	6.875%
3.00% notes, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	298,691	0
Debt Instrument, Fair Value	300,000	0
Repayments of Long-term Debt	300,000
Debt Instrument, Interest Rate, Stated Percentage	3.00%
6.00% notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	299,945	299,936
Debt Instrument, Fair Value	330,000	342,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%
5.125% notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	249,435	249,356
Debt Instrument, Fair Value	260,000	272,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%
4.50% notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	297,767	0
Debt Instrument, Fair Value	291,000	0
Repayments of Long-term Debt	300,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%
7.50% senior debentures, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	198,170	198,030
Debt Instrument, Fair Value	232,000	246,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Other obligations with various interest rates and due dates [Member]
Debt Instrument [Line Items]
Long-term debt	8,042	34,955
Senior Notes Due in 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value	0	342,000
Debt Instrument, Interest Rate, Stated Percentage	6.875%
Redemption of senior notes	(332,107)	(17,893)
Revolving Credit Facility due in 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	0	123,600
Line of Credit Facility, Maximum Borrowing Capacity	1,500,000
Line of Credit Facility, Interest Rate Spread at Period End	1.30%
Line of Credit Facility Commitment Fee Percentage	0.20%
Revolving Credit Facility due in 2016 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,200,000

Asset Securitization Program Facility Fee.

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Asset Securitization Program Interest Rate At Period End.

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Asset Securitization Program Maximum Capacity

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Extinguishment of Debt Gain Loss Net of Tax Per Share Basic

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No definition available.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Gross amount of debt extinguished.

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No definition available.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The amount of cash paid for interest during the period.

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

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The cash outflow to settle a bank borrowing during the year.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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