Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Share-Based Compensation and Capital Stock - Weighted Average Assumptions Of Black-Scholes Option-Pricing Model (Details) - $ / shares			3 Months Ended
	May 07, 2021	Feb. 28, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Share-Based Compensation and Capital Stock [Line Items]
Cash dividends declared per share (in dollars per share)		$ 0.225	$ 0	$ 0.225	$ 0.225	$ 0.215
Subsequent Event
Share-Based Compensation and Capital Stock [Line Items]
Cash dividends declared per share (in dollars per share)	$ 0.225
Stock options
Share-Based Compensation and Capital Stock [Line Items]
Risk-free interest rate			0.94%
Expected volatility			29.23%
Expected life of stock option			5 years 10 months 24 days
Dividend yield			0.82%
Requisite service period			4 years
Contractual life			10 years
Weighted average fair value of options granted (in dollars per share)			$ 28.00