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Share-Based Payments - Weighted-average Assumptions (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Options
Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Options
Expected volatility (percent)	24.80%	25.30%	29.20%
Risk-free interest rate (percent)	1.00%	2.70%	2.70%
Expected life (years)	7 years 1 month 6 days	7 years 1 month 6 days	7 years 1 month 6 days
Dividend yield (percent)	2.00%	2.10%	2.20%
Stock Appreciation Rights (SARs)
Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Options
Expected volatility (percent)		38.60%
Risk-free interest rate (percent)		1.50%
Expected life (years)		3 months 18 days
Dividend yield (percent)		0.00%

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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.

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

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-Publisher FASB
-Name Accounting Standards Codification
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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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