Organization and Significant Accounting Policies - Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of year	$ 181.1	$ 172.9	$ 132.9
Additions charged to expense	165.4	209.1	183.5
Warranty claims paid, net	(183.7)	(200.9)	(143.5)
Balance at end of year	$ 162.8	$ 181.1	$ 172.9