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Stock-based Compensation - Weighted Average Valuation Assumptions (Details) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend Yield	0.40%	0.30%	0.30%
Expected Volatility	39.40%	36.50%	34.80%
Risk-free Interest Rate	0.90%	2.50%	2.60%
Expected Term (in years)	5 years 3 months 18 days	5 years 3 months 18 days	5 years 3 months 18 days
Weighted-average Fair Value of Stock Options Granted (in dollars per share)	$ 13.48	$ 19.59	$ 16.54

X

- 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB
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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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-Publisher FASB
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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.

+ References

No definition available.

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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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- Definition

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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