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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Stock Options Valuation Assumptions (Details) - Options - $ / shares

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Fair Value Assumptions

Weighted average grant date fair value

$ 3.40

$ 7.12

$ 8.61

Weighted average expected volatility (a)

^[1]

31.40%

28.50%

30.70%

Weighted average expected term (years) (b)

^[2]

6 years 3 months

6 years 3 months

6 years 3 months

Weighted average risk-free interest rate (c)

^[3]

2.50%

2.70%

2.00%

Weighted average dividend yield

2.70%

1.40%

1.20%

[1]	Expected volatility was based on historical volatilities of the Company and select comparable companies.
[2]	The expected term of the options granted represents the period of time that options are expected to be outstanding and is based on the simplified method.
[3]	The risk-free interest rate was based on the U.S. Treasury yield curve in effect at the time of the grant, which corresponds to the expected term of the options.

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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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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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