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Share-Based Compensation Plans - Weighted Average Assumptions, Options Granted (Details) - Equity Options - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-average assumptions used for options granted
Expected dividends (as a percent)	3.70%	2.80%	2.30%
Expected volatility (as a percent)	31.40%	29.40%	28.50%
Risk-free rate (as a percent)	2.40%	2.70%	1.90%
Expected term in years	4 years 4 months 24 days	4 years 4 months 24 days	4 years 4 months 24 days
Grant-date fair value (in dollars per share)	$ 11.74	$ 15.89	$ 15.71

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No definition available.

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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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-Publisher FASB
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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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