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Share-Based Payments - Weighted-average Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options [Member]
Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Options
Expected volatility (percent)	29.20%	30.50%	37.20%
Risk-free interest rate (percent)	2.70%	2.10%	1.60%
Expected life (years)	7 years 1 month	7 years 8 months	7 years 6 months
Dividend yield (percent)	2.20%	2.20%	2.10%
Stock Appreciation Rights (SARs) [Member]
Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Options
Expected volatility (percent)	27.10%	28.70%
Risk-free interest rate (percent)	2.60%	1.90%
Expected life (years)	1 year 3 months	2 years 1 month
Dividend yield (percent)	0.00%	0.00%

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No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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