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Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions				9 Months Ended	12 Months Ended
	Sep. 12, 2019	Aug. 09, 2019	Feb. 25, 2019	Sep. 30, 2020	Dec. 31, 2018	Dec. 31, 2019	May 06, 2019	Apr. 30, 2019	Feb. 22, 2019
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)				190,300,000		191,700,000
Preferred stock, shares outstanding (in shares)				0		0
Common stock, shares issued (in shares)				226,900,000		226,900,000
Preferred stock, shares issued (in shares)				0		0
Common Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)							3,515,500
GE Transportation
Business Acquisition [Line Items]
Consideration transferred			$ 2,875.0
Total future consideration			470.0
Business combination, consideration transferred			10,300.0
Closing share price (in USD per share)									$ 73.36
Change in estimated fair values for assets acquired				$ 30.9
GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Total future consideration			$ 10.0
GE Transportation | Convertible Preferred Stock
Business Acquisition [Line Items]
Shares issuable (in shares)			10,000
GE Transportation | General Electric Company
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			9.90%
GE Transportation | General Electric Company | Convertible Preferred Stock
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			15.00%
GE Transportation | GE and Pre-Merger Holders
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			49.20%
General Electric Company
Business Acquisition [Line Items]
Noncontrolling interest acquired			$ 88.3
Other noncurrent liabilities			661.0
General Electric Company | Customer Contracts
Business Acquisition [Line Items]
Other noncurrent liabilities			$ 524.6
GET Brazil
Business Acquisition [Line Items]
Noncontrolling interest acquired								$ 56.2
General Electric Company
Business Acquisition [Line Items]
Total future consideration					$ 2,885.0
Common stock, shares issued (in shares)						19,018,207
Preferred stock, shares issued (in shares)						10,000
General Electric Company | General Electric Company
Business Acquisition [Line Items]
Common stock, shares issued (in shares)						46,763,975
General Electric Company | GE Transportation | SpinCo Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)			8,700,000,000
General Electric Company | GE Transportation | SpinCo Class A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			15,000
General Electric Company | GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			10,000
General Electric Company | GE Transportation | SpinCo Class C Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			1
General Electric Company | GE Transportation | Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)							8,780
General Electric Company | GE Transportation | Common Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)							25,300,000
Number of shares sold (in shares)	2,048,515	16,969,656
Pre-merger Wabtec Stockholders | GE Transportation
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			50.80%
Wabtec | GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			10,000

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