Dividends - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Dividends [Abstract]
Dividends declared and paid	$ 14.6	$ 16.4	$ 44.2	$ 50.3
Dividends declared and paid, per share	$ 0.20	$ 0.20	$ 0.60	$ 0.60