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Significant Accounting Policies Activity in Polaris Accrued Warranty Reserve (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Activity in Product Warranty Reserve [Roll Forward]    
Balance at beginning of period $ 140.8 $ 136.2
Additions charged to expense 34.6 24.2
Warranty claims paid, net (35.5) (27.6)
Balance at end of period $ 139.9 $ 132.8