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Debt - Commercial Paper (Details) - USD ($) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Feb. 28, 2014 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 26, 2015
Commercial Paper | United States |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maturity period of debt |  | 397 days | 24 years 2 months 1 day |  |
Maximum borrowing capacity under credit facility |  |  |  |  | $ 1,800,000,000
Weighted average interest rate on debt |  |  | 2.34% |  |
Commercial Paper | Europe |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maturity period of debt | 183 days |  | 25 years 6 months 9 days |  |
Weighted average interest rate on debt |  |  | (0.20%) |  |
Carrying value | United States |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commercial paper |  |  | $ 342,400,000 | $ 228,500,000 |
Carrying value | Europe |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commercial paper |  |  | $ 935,921,000 | $ 912,146,000 |

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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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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