Debt - LT Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 2,696,334	$ 2,380,575
Accounts receivable, net	6,746,687	6,161,418
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	93,827
Long-term Debt, Maturities, Repayments of Principal in Year Two	500,737
Long-term Debt, Maturities, Repayments of Principal in Year Three	461,573
Long-term Debt, Maturities, Repayments of Principal in Year Four	299,611
Long-term Debt, Maturities, Repayments of Principal in Year Five	248,852
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,185,561
Redemption of Notes, Principal Amount		250,000
Net proceeds from note offering	0	688,162	$ 0
Loss on prepayment of debt	0	2,943	0
Investment Income, Interest and Dividend	18,680	6,301	5,552
Interest Paid	141,816	133,390	$ 120,477
Asset securitization program [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Prior Maximum Borrowing Capacity	900,000
Long-term debt	$ 460,000	75,000
Debt Instrument, Interest Rate, Effective Percentage	1.31%
Accounts receivable, net	$ 2,045,464	$ 1,871,831
Asset Securitization Program Interest Rate Spread At End of Period	0.40%
Asset Securitization Program Facility Fee	0.40%
Line of Credit Facility, Maximum Borrowing Capacity	$ 910,000
3.375% notes, due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%	3.375%
6.875% senior debentures, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 199,348	$ 198,886
Debt Instrument, Fair Value	$ 212,500	218,000
Debt Instrument, Interest Rate, Stated Percentage	6.875%
3.00% notes, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 299,013	298,197
Debt Instrument, Fair Value	$ 303,500	303,000
Debt Instrument, Interest Rate, Stated Percentage	3.00%
6.00% notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 299,183	298,932
Debt Instrument, Fair Value	$ 325,500	330,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%
5.125% notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 248,843	248,566
Debt Instrument, Fair Value	$ 265,500	267,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%
notes due in 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 345,776	345,061
Debt Instrument, Fair Value	$ 349,500	343,000
Debt Instrument, Face Amount		$ 350,000
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
4.50% notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 296,646	$ 296,194
Debt Instrument, Fair Value	$ 305,500	309,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%
notes due in 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 344,625	344,092
Debt Instrument, Fair Value	$ 345,000	336,000
Debt Instrument, Face Amount		$ 350,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%
7.50% senior debentures, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 198,514	$ 198,366
Debt Instrument, Fair Value	$ 238,000	238,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Interest rate swaps designated as fair value hedges [Member]
Debt Instrument [Line Items]
Long-term debt	$ 152	711
Other obligations with various interest rates and due dates [Member]
Debt Instrument [Line Items]
Long-term debt	4,234	4,570
Uncommitted Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000
Commercial Paper [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,200,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Prior Maximum Borrowing Capacity	1,500,000
Long-term debt	$ 0	$ 72,000
Debt Instrument, Interest Rate, Effective Percentage	1.99%
Asset Securitization Program Interest Rate Spread At End of Period	1.18%
Asset Securitization Program Facility Fee	0.20%
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,800,000

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Face (par) amount of debt instrument at time of issuance.

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

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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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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 payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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