Goodwill and Other Intangible Assets - Changes on the Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill		$ 397,300	$ 659,900	$ 647,100
Goodwill, Impairment Loss	$ (270,300)	(270,300)	0
Currency translation effect on foreign goodwill balances		7,700	(1,300)
Goodwill, Gross		667,600
Goodwill, Impaired, Accumulated Impairment Loss		(270,300)
Goodwill acquired and related adjustments		0	14,100
ORV/Snowmobiles
Goodwill [Line Items]
Goodwill		72,900	72,000	71,800
Currency translation effect on foreign goodwill balances		900	200
Goodwill, Gross		72,900
Motorcycles
Goodwill [Line Items]
Goodwill		5,200	5,200	3,400
Goodwill, Gross		5,200
Goodwill acquired and related adjustments			1,800
Global Adjacent Markets
Goodwill [Line Items]
Goodwill		92,100	85,200	86,800
Currency translation effect on foreign goodwill balances		6,900	(1,600)
Goodwill, Gross		92,100
Aftermarket
Goodwill [Line Items]
Goodwill		0	270,400	270,300
Goodwill, Impairment Loss		(270,300)
Currency translation effect on foreign goodwill balances		(100)	100
Goodwill, Gross		270,300
Goodwill, Impaired, Accumulated Impairment Loss		(270,300)
Boats
Goodwill [Line Items]
Goodwill		227,100	227,100	$ 214,800
Goodwill, Gross		$ 227,100
Goodwill acquired and related adjustments			$ 12,300