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Stock-Based Compensation - Fair Value of Options on Grant Date (Details) - Stock Options - $ / shares	1 Months Ended	3 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Nov. 30, 2020	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 9.05	$ 6.93	$ 7.99	$ 4.59	$ 14.87
Expected life of options	7 years 2 months 12 days	5 years 4 months 24 days	5 years 7 months 6 days	4 years 7 months 6 days	5 years 3 months 18 days
Risk-free interest rate	0.50%	1.70%	2.60%	0.40%	2.70%
Expected volatility (as a percent)	60.80%	46.60%	33.30%	64.90%	28.20%
Expected annual dividend per share (in dollars per share)	$ 0.00	$ 0.40	$ 0.84	$ 0.00	$ 0.84

X

- Definition

The estimated amount of dividend per share to be paid to holders of the underlying shares (expected dividends) over the option's term.

+ References

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

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

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