Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 50.7	$ 58.8	$ 57.9
Increases resulting from tax positions taken during a prior period	3.8	10.8	6.4
Decreases resulting from tax positions taken during a prior period	(4.5)	(18.6)	(4.2)
Increases resulting from tax positions taken during the current period	7.4	6.7	6.4
Decreases related to settlements with taxing authorities	(3.8)	(1.0)	(0.3)
Increases related to settlements with taxing authorities	0.0	0.0	0.0
Reductions related to the lapse of statute of limitations	(5.1)	(6.0)	(7.4)
Unrecognized tax benefits at end of year	$ 48.5	$ 50.7	$ 58.8