Share repurchase program nondeductible excise tax.

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- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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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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- Definition

Amount of excise tax on share purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

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- Definition

Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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- Definition

Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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- Definition

Number of shares of common and preferred stock retired from treasury during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

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Treasury Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended
	Mar. 09, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2025	Feb. 27, 2026	Aug. 31, 2025
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased	334,600	18,080	675,712
Shares repurchased price per share	$ 210.67
Stock repurchase program aggregate purchase price	$ 70.5	$ 6.0	$ 141.4	$ 43.7
Treasury shares retired			0
Treasury shares reissued			0
Share repurchase, nondeductible excise tax percent			1.00%
Stock repurchase program, remaining available under Repurchase Plans		$ 88.1	$ 88.1
Excise tax on net share repurchases			$ 1.4	$ 0.3
Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased			1,010,312
Stock repurchase program aggregate purchase price			$ 211.9
Class A common stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased				274,490
Stock repurchase program, remaining available under Repurchase Plans					$ 113.2	$ 125.0
Maximum [Member] \| Class A common stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized					$ 300.0