Fair Value of TSR Performance-Based Restricted Stock Units Estimated Using Monte-Carol Valuation Model (Details) - TSR Performance-based Restricted Stock Units	12 Months Ended
Dec. 31, 2020 $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant-date stock price	$ 96.28
Expected volatility	34.25%
Risk-free interest rate	1.35%
Expected annual dividend yield	0.00%
Weighted average fair value	$ 126.65

The stock price on grant date of share based compensation units.

No definition available.

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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 performance stock unit's term.

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No definition available.

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- Definition

The risk-free interest rate assumption that is used in valuing a performance stock unit.

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No definition available.

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- Definition

The weighted average grant-date fair value of performance stock units granted during the reporting period.

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No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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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No definition available.

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