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.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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(22))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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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Fair value portion of notes payable.

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Long-Term Debt (Commercial Paper) (Details) - USD ($)			12 Months Ended
Long-Term Debt (Commercial Paper) (Details) - USD ($)	Jul. 31, 2015	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	May 21, 2015
Commercial paper
Line of Credit Facility [Line Items]
Utilized borrowings under credit facility			$ 820,303,000
United States \| Commercial paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facility					$ 1,800,000,000
Maturity period of debt			15 years 7 months 13 days
Weighted average interest rate on debt			(0.98%)
United States \| Minimum \| Commercial paper
Line of Credit Facility [Line Items]
Maturity period of debt		1 day
United States \| Maximum \| Commercial paper
Line of Credit Facility [Line Items]
Maturity period of debt		397 days
Europe \| Commercial paper
Line of Credit Facility [Line Items]
Maturity period of debt			28 years 11 months 1 day
Weighted average interest rate on debt			(0.11%)
Europe \| Minimum \| Commercial paper
Line of Credit Facility [Line Items]
Maturity period of debt	1 day
Europe \| Maximum \| Commercial paper
Line of Credit Facility [Line Items]
Maturity period of debt	183 days
Carrying Value \| United States
Line of Credit Facility [Line Items]
U.S. commercial paper			$ 283,800,000	$ 284,800,000
Carrying Value \| Senior secured credit facility due July 8 2016
Line of Credit Facility [Line Items]
Notes payable			$ 536,503,000	$ 472,067,000