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Debt (Schedule of Weighted Average Interest Rates) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Disclosure [Abstract] |  |  |
Short-term debt | 1.40% | 2.70% | 3.00%
Revolving credit facilities | 3.30% | 3.80% | 4.40%

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- Definition Line of credit facility weighted average interest rate + References No definition available. + Details
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Period Type: | duration

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- References No definition available. + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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