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Stock-Based Compensation - Weighted Average Assumptions for PRSUs (Details) - Performance Restricted Stock Units (PRSUs)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expected term (in years)	2 years 10 months 13 days	2 years 10 months 9 days	2 years 10 months 9 days
Expected volatility	46.20%	43.50%	39.00%
Risk-free interest rate	1.36%	2.48%	2.35%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Correlation range	17.40%	2.40%	11.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Correlation range	82.90%	88.10%	85.70%

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Correlation Rate

+ References

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

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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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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