Asset Securitization Program Facility Fee.

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- Definition

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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Extinguishment of Debt Gain Loss Net of Tax Per Share Diluted

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- Definition

Principal Amount of Issuance of Long-term Debt

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- Definition

Redemption of Senior Notes, principal amount

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Redemption of Notes, Principal Amount

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

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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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 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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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 in the next 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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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 in 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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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 in the fourth 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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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 in the third 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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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 in the second 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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Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

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Debt - LT Debt (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 2,380,575	$ 2,067,898
Accounts receivable, net	6,161,418	6,043,850
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	44,024
Long-term Debt, Maturities, Repayments of Principal in Year Two	78,284
Long-term Debt, Maturities, Repayments of Principal in Year Three	569,834
Long-term Debt, Maturities, Repayments of Principal in Year Four	530
Long-term Debt, Maturities, Repayments of Principal in Year Five	299,588
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,432,279
Redemption of Notes, Principal Amount	250,000
Net proceeds from note offering	688,162	0	$ 591,156
Loss on prepayment of debt	2,943	$ 0	4,277
Loss on prepayment of debt, net of tax	$ 1,808		(2,627)
Extinguishment of Debt Gain Loss Net of Tax Per Share Basic	$ 0.02	$ 0.03
Extinguishment of Debt Gain Loss Net of Tax Per Share Diluted	$ 0.03
Investment Income, Interest and Dividend	$ 6,301	$ 5,552	5,632
Interest Paid	133,390	120,477	$ 116,663
Asset securitization program [Member]
Debt Instrument [Line Items]
Long-term debt	75,000	275,000
Asset Securitization Program Maximum Capacity	$ 900,000
Asset Securitization Program Interest Rate Spread At End of Period	0.40%
Debt Instrument, Interest Rate, Effective Percentage	0.86%
Asset Securitization Program Facility Fee	0.40%
Accounts receivable, net	$ 1,871,831	2,060,589
3.375% notes, due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt	0	251,955
Debt Instrument, Fair Value	$ 0	255,000
Debt Instrument, Interest Rate, Stated Percentage	3.375%
6.875% senior debentures, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 198,886	198,424
Debt Instrument, Fair Value	$ 218,000	232,000
Debt Instrument, Interest Rate, Stated Percentage	6.875%
3.00% notes, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 298,197	297,408
Debt Instrument, Fair Value	$ 303,000	309,000
Principal Amount of Issuance of Long-term Debt		300,000
Debt Instrument, Interest Rate, Stated Percentage	3.00%
Notes Due in 2018 [Domain]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.00%
6.00% notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 298,932	298,680
Debt Instrument, Fair Value	$ 330,000	339,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%
5.125% notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 248,566	248,287
Debt Instrument, Fair Value	$ 267,500	277,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%
notes due in 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 345,061	0
Debt Instrument, Fair Value	343,000	0
Debt Instrument, Face Amount	$ 350,000
Debt Instrument, Interest Rate, Stated Percentage	3.50%
4.50% notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 296,194	295,765
Debt Instrument, Fair Value	$ 309,000	321,000
Principal Amount of Issuance of Long-term Debt		300,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Notes Due in 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%
notes due in 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 344,092	0
Debt Instrument, Fair Value	336,000	0
Debt Instrument, Face Amount	$ 350,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%
7.50% senior debentures, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 198,366	198,219
Debt Instrument, Fair Value	$ 238,000	254,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Revolving Credit Facility due in 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.58%
Interest rate swaps designated as fair value hedges [Member]
Debt Instrument [Line Items]
Long-term debt	$ 710	378
Other obligations with various interest rates and due dates [Member]
Debt Instrument [Line Items]
Long-term debt	4,571	$ 3,782
Uncommitted Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000
Senior Notes Due in 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.875%
Redemption of senior notes		$ (332,107)
Revolving Credit Facility due in 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 72,000	$ 0
Line of Credit Facility, Interest Rate Spread at Period End	1.30%
Line of Credit Facility Commitment Fee Percentage	0.20%
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500,000