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Share-Based Compensation - Summary of Changes In Stock Options (Detail) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares outstanding, beginning balance (in shares) | shares	2.7
Granted (in shares) | shares	2.4
Exercised (in shares) | shares	(0.3)
Forfeited (in shares) | shares	0.0
Shares outstanding, ending balance (in shares) | shares	4.8
Options exercisable, end of year (in shares) | shares	1.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in USD per share) | $ / shares	$ 18
Weighted-average exercise price, granted (in USD per share) | $ / shares	24
Weighted-average exercise price, exercised (in USD per share) | $ / shares	15
Weighted-average exercise price, forfeited (in USD per share) | $ / shares	20
Weighted average exercise price, ending balance (in USD per share) | $ / shares	21
Weighted average exercise price, options exercisable, end of year (in USD per share) | $ / shares	$ 18
Weighted average remaining life, outstanding (years)	8 years 6 months
Aggregate intrinsic value, outstanding | $	$ 7.8
Weighted average remaining life, exercisable (years)	7 years 10 months 24 days
Aggregate intrinsic value, exercisable | $	$ 4.4

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Share Based Compensation Arrangement By Share Based Payment Award, Options Exercises In Period, Weighted Average Ex Price

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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