Acquisitions and Divestitures - Divestitures (Details) - USD ($)		3 Months Ended			9 Months Ended
	Sep. 02, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of businesses					$ 453,900,000	$ 3,600,000
Disposal by Sale | Motor Wheel Brake Drum and Crewson Brake
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of businesses	$ 8,900,000
Previously accrued cash restructuring charges	$ 3,700,000		$ 3,700,000
Gain (loss) on sales of business			(3,600,000)
Disposal by Sale | Air Springs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Outstanding account receivable			7,200,000		$ 7,200,000
Disposal by Sale | Air Springs | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of businesses		$ 32,000,000.0
Accounts receivable face amount		$ 7,500,000
Disposal by Sale | Lunar Air Disc Brake
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of businesses			300,000
Previously accrued cash restructuring charges				$ (2,100,000)
Gain (loss) on sales of business			200,000
Impairment and (adjustments) of impaired long lived assets			(200,000)	1,600,000
Assets held for sale | Lunar Air Disc Brake
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Impairment and (adjustments) of impaired long lived assets			$ (200,000)	$ 2,100,000