Employee service share based compensation tax benefit related to equity plan.

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- Definition

Employee service share based compensation tax expense (benefit) from exercises.

+ References

No definition available.

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- Definition

Number of shares withheld to satisfy tax obligations.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

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

+ References

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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No definition available.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

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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- Definition

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

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

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Number of shares issued under share-based payment arrangement.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of options vested.

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No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized tax expense (benefit) on exercises	$ 0.1	$ (22.1)
Tax benefit on share-based compensation expense	2.9	1.3
Total tax benefit related to equity plans	$ 2.8	$ 23.4
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,466,000		1,167,000
Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of stock option vested	$ 2.7
Unrecognized compensation expense expected to be recognized	3 years 2 months 12 days
Restricted stock units outstanding	108,000		105,000
Share-settled restricted stock units vested	3,927
Number of shares withheld to satisfy tax obligations	1,473
Shares issued	2,454
Granted, weighted average grant date fair value (in dollars per share)	$ 404.60	$ 691.99
Unrecognized share-based compensation expense	$ 44.1
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	123,625
Aggregate fair value of stock option vested	$ 28.4
Weighted average grant date fair value of stock option awards	$ 227.51	$ 381.26
Share-based compensation expense recognized	$ 10.4	$ 5.3
Unrecognized share-based compensation expense	$ 154.2
Unrecognized compensation expense expected to be recognized	3 years 3 months 18 days
2013 Equity Plan \| Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 3.2	1.2
Restricted stock units outstanding	108,273
2013 Equity Plan \| Other Stock Based Awards and Cash Settled RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 0.1	0.9
Unrecognized compensation expense expected to be recognized	2 years 9 months 18 days
Unrecognized share-based compensation expense	$ 2.0
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,465,779
2013 Equity Plan \| Class A \| Employees, Officers, and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	2,750,000
Shares of class A common stock reserved and available for future issuance	241,334
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 0.6	$ 0.4
Unrecognized compensation expense expected to be recognized	4 months 24 days
Unrecognized share-based compensation expense	$ 0.8
2021 Employee Stock Purchase Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	100,000
Shares of class A common stock reserved and available for future issuance	87,938
Common stock, shares issued	7,450