Stock-Based Compensation - Measurement Inputs (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance Shares
Stock-Based Compensation Details [Line Items]
Term (years)	3 years	3 years	3 years	3 years
Granted (dollars per share)	$ 37.59	$ 19.46	$ 27.36
Equity Option
Stock-Based Compensation Details [Line Items]
Risk-free interest rate (percent)			2.63%
Dividend yield (percent)			3.25%
Historical volatility (percent)			27.25%
Expected term (years)			6 years 1 month 17 days
Weighted average fair value (dollars per share)			$ 5.71
TSR \| Performance Shares
Stock-Based Compensation Details [Line Items]
Term (years)	3 years	3 years	3 years
Risk-free interest rate (percent)	1.60%	2.51%	2.39%
Dividend yield (percent)	2.80%	3.97%	3.24%
Historical volatility (percent)	29.49%	32.95%	29.12%
Granted (dollars per share)	$ 41.28	$ 16.27	$ 32.01

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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 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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- Definition

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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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