Commitments and Contingencies - Narrative (Details)									1 Months Ended	3 Months Ended				9 Months Ended	12 Months Ended		57 Months Ended
	Nov. 02, 2020 EUR (€)	Oct. 21, 2020 USD ($)	Sep. 21, 2020 EUR (€)	Jun. 30, 2018 site	Dec. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Mar. 03, 2016 USD ($)	Apr. 11, 2014 USD ($) mi	Aug. 31, 2016 residence sampling_event	Sep. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2020 USD ($) site Potentially_Responsible_Party mi	Dec. 31, 2016 USD ($) site	Dec. 31, 2015 USD ($) site	Sep. 30, 2020 USD ($) site mi	Sep. 30, 2020 EUR (€) site mi	Jun. 30, 2016 EUR (€)	Oct. 15, 2015 mine	Apr. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 19, 2014 site
Site Contingency
Number of sites subject to remediation (sites) | site														20			20	20
Number of sites, cost in excess of 100K (sites) | site														17			17	17
Cost per site minimis threshold														$ 100,000
Number of sites, discontinued operations (sites) | site														18			18	18
Number of sites, active operations (sites) | site														2			2	2
Number of sites, investigation completed (sites) | site														16			16	16
Number of sites investigation in progress (sites) | site														3			3	3
Number of sites remediation for soil and groundwater contamination (sites) | site														14			14	14
Environmental											$ 36,000,000.0			$ 31,400,000			$ 31,400,000
Portion of site subject to remediation (miles) | mi								8
Number of other potentially responsible parties				120										70
Estimate of cost																					$ 726,000,000
Estimate low end						$ 165,000,000
Estimated development time						4 years
Investigate sites notice from EPA (sites) | site															6
Provision for new losses												$ 1,000,000.0	$ 1,900,000		$ 1,100,000	$ 1,100,000
Investigative sites (sites) | site															8
Accrual component amount														$ 1,000,000.0			1,000,000.0
Number of residences above applicable screening levels (residences) | residence									3
Number of sampling events below applicable screening levels | sampling_event									2
Estimated insurance recoveries														25,000,000			25,000,000
Insurance recoveries to date														22,000,000
Estimated recovery for non-GST Trust claimants														10,000,000			10,000,000
Threshold of recovery before shared in trust														3,000,000			3,000,000
Coltec Industries Inc.
Site Contingency
Environmental														17,700,000	$ 1,300,000		17,700,000
Provision for new losses					$ 5,700,000							$ 3,500,000
Lower passaic river study area, focused feasibility study, April 11, 2014
Site Contingency
Environmental														$ 2,600,000			$ 2,600,000					$ 3,500,000
Minimum | Lower passaic river study area, focused feasibility study, April 11, 2014
Site Contingency
Site contingency, loss exposure in excess of accrual best estimate							$ 1,380,000,000	$ 953,000,000
Maximum
Site Contingency
Portion of site subject to remediation (miles) | mi														9			9	9
Maximum | Lower passaic river study area, focused feasibility study, April 11, 2014
Site Contingency
Site contingency, loss exposure in excess of accrual best estimate							$ 1,730,000,000
Mississippi Circuit Court in Yalobusha County
Site Contingency
Loss accrual current														$ 17,700,000			$ 17,700,000
Legal settlement expense														14,000,000
Borgwarner
Site Contingency
Amount sought | €			€ 31,000,000
Amount awarded to other party | €			10,400,000
Legal fees | €			256,000
Reimbursement charges | €			931,000
Reimbursement for expenses incurred by customer | €			€ 100,000
Loss accrual | €																		€ 6,600,000	€ 400,000
Legal settlement expense | €										€ 6,200,000
Subsequent Event | Mississippi Circuit Court in Yalobusha County
Site Contingency
Amount awarded to other party		$ 14,000,000
Arizona
Site Contingency
Investigate sites notice from EPA (sites)																2				6			2
Mississippi
Site Contingency
Provision for new losses											$ 4,700,000
GGB France | Borgwarner | Subsequent Event | Borgwarner
Site Contingency
Payment to settle litigation | €	€ 6,600,000
Environmental Remediation
Site Contingency
Loss in period																	900,000
Asbestos Issue
Site Contingency
Insurance coverage amount														4,200,000			4,200,000
Estimated insurance recoveries, current year														700,000			700,000
Asbestos Issue | GST, LLC
Site Contingency
Insurance recoveries from insolvent carriers														$ 8,800,000			$ 8,800,000
Affiliated Entity | Crucible Steel Corporation
Site Contingency
Portion of site subject to remediation (miles) | mi														17			17	17