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Treasury Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Mar. 09, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Feb. 27, 2026	Aug. 31, 2025
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased	334,600	578,022
Shares Acquired, Average Cost Per Share	$ 210.67
Treasury Stock, Value, Acquired, Cost Method	$ 70.5	$ 116.2	$ 186.7	$ 43.7
Stock repurchase program aggregate purchase price	$ 70.5	$ 116.2	$ 186.7	$ 43.7
Treasury shares reissued			0
Treasury Stock, Shares, Acquired	334,600	578,022
Stock repurchase program, remaining available under Repurchase Plans		$ 113.3	$ 113.3
Class A common stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased			912,622	274,490
Treasury Stock, Shares, Acquired			912,622	274,490
Stock repurchase program, remaining available under Repurchase Plans					$ 113.3	$ 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