Acquisitions - General Electric Transportation (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Sep. 12, 2019	Aug. 09, 2019	Feb. 25, 2019	Dec. 31, 2018	Sep. 30, 2019	May 06, 2019	Apr. 30, 2019	Feb. 22, 2019
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)				96,614,946	191,676,482
Preferred stock, shares outstanding (in shares)				0	0
Common stock, shares issued (in shares)					226,947,180
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
GE Transportation | Convertible Preferred Stock
Business Acquisition [Line Items]
Shares issuable (in shares)			10,000
GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Total future consideration			$ 10.0
GE Transportation | GE and Pre-Merger Holders
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				49.20%
GE Transportation | General Electric Company
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			9.90%	9.90%
GE Transportation | General Electric Company | Convertible Preferred Stock
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				15.00%
GET Brazil
Business Acquisition [Line Items]
Noncontrolling interest acquired							$ 56.2
General Electric Company
Business Acquisition [Line Items]
Noncontrolling interest acquired			$ 86.8
Wabtec | Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)					15,000
Wabtec | GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)				10,000
Pre-merger Wabtec Stockholders | GE Transportation
Business Acquisition [Line Items]
Percentage of outstanding shares transferred				50.80%
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 | 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
General Electric Company | GE Transportation | SpinCo Class A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			15,000	15,000
General Electric Company | GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			10,000
Minimum | General Electric Company | GE Transportation
Business Acquisition [Line Items]
Percentage of common shares outstanding				14.90%
Maximum | Pre-merger Wabtec Stockholders | GE Transportation
Business Acquisition [Line Items]
Percentage of common shares outstanding				18.50%
Maximum | General Electric Company | GE Transportation
Business Acquisition [Line Items]
Percentage of common shares outstanding				19.90%