Share based compensation arrangement by share based payment award exercise period after employment termination.

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, performance period.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for 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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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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Share-Based Compensation - Additional Information (Detail) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future grants of equity awards	9.7		9.7
Share-based compensation expense	$ 40,800,000	$ 41,500,000	$ 78,800,000	$ 81,700,000
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense related to unvested stock option awards not yet recognized	0		0
Term Based Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense related to unvested stock option awards not yet recognized	4,100,000		$ 4,100,000
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period			1 month 6 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period			1 year 9 months 18 days
Share-based compensation expense related to unvested PSUs not yet recognized	188,000,000		$ 188,000,000
Performance Stock Units ("PSUs") [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period			2 years 2 months 12 days
Share-based compensation expense related to unvested PSUs not yet recognized	$ 46,900,000		$ 46,900,000
HCM Stock Incentive Plan 2013 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares outstanding	12.7		12.7
HCM Equity Incentive Plan 2018 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation arrangement by share based payment award exercise period after employment termination			90 days
HCM Equity Incentive Plan 2018 [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock vesting period			1 year
HCM Equity Incentive Plan 2018 [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock vesting period			3 years
HCM Global Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future grants of equity awards	1.3		1.3
Management Incentive Plan [Member] \| Performance Stock Units ("PSUs") [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period			3 years