Basis of Presentation and Significant Accounting Policies - Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Activity in Product Warranty Reserve [Roll Forward]
Balance at beginning of period	$ 174.1	$ 154.6	$ 181.1	$ 172.9
Additions charged to expense	45.8	49.3	132.7	141.7
Warranty claims paid, net	(44.7)	(40.9)	(138.6)	(151.6)
Balance at end of period	$ 175.2	$ 163.0	$ 175.2	$ 163.0