Long-Term Debt (Fair Value and Carrying Value of Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less current portion of long term debt and commercial paper	$ 2,003,003	$ 851,305
Long-term debt, less current portion	3,199,931
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial paper	756,867	301,600
Capital leases and other	16,805	10,620
Total debt	3,192,816	2,288,898
Less current portion of long term debt and commercial paper	2,003,578	851,305
Long-term debt, less current portion	1,189,238	1,437,593
Fair Value [Member] \| Secured Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitization facility	500,000	500,000
Fair Value [Member] \| 3.85% Senior Notes Due February 1, 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	584,730	603,180
Fair Value [Member] \| 6.125% Notes, Payable January 15, 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	646,130	677,833
Fair Value [Member] \| 2.00% Senior Notes Due January 14, 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	554,209	0
Fair Value [Member] \| Five-year senior secured credit facility, due March 26, 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	134,075	195,665
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial paper	756,867	301,600
Capital leases and other	16,807	10,620
Total debt	3,199,931	2,253,440
Less current portion of long term debt and commercial paper	2,003,003	851,305
Long-term debt, less current portion	1,196,928	1,402,135
Carrying Value [Member] \| Secured Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitization facility	500,000	500,000
Carrying Value [Member] \| 3.85% Senior Notes Due February 1, 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	600,000	600,000
Carrying Value [Member] \| 6.125% Notes, Payable January 15, 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	645,555	645,555
Carrying Value [Member] \| 2.00% Senior Notes Due January 14, 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	546,627	0
Carrying Value [Member] \| Five-year senior secured credit facility, due March 26, 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	$ 134,075	$ 195,665

Capital Leases And Other, Fair Value

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(2))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 7

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

+ Details

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

+ Details

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of notes payable.

+ References

+ Details

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