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ACQUISITIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Sep. 12, 2019	Aug. 09, 2019	Feb. 25, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 06, 2019	Apr. 30, 2019	Feb. 22, 2019
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)				188,900,000	191,700,000
Preferred stock, shares outstanding (in shares)				0	0
Acquisition payments				$ 40.9	$ 10,115.7	$ 58.9
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
General Electric Company
Business Acquisition [Line Items]
Acquisition payments					$ 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
GE Transportation
Business Acquisition [Line Items]
Consideration transferred			$ 2,875.0
Acquisition payments			470.0	$ 115.4
Business combination, consideration transferred			$ 10,300.0
Purchase price per share (in euros per share)									$ 73.36
Change in estimated fair values for assets acquired				$ 47.5	$ 63.0
GE Transportation | General Electric Company
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			9.90%
GE Transportation | GE and Pre-Merger Holders
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			49.20%
GE Transportation | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Acquisition payments			$ 10.0
GE Transportation | Convertible Preferred Stock
Business Acquisition [Line Items]
Shares issuable (in shares)			10,000
GE Transportation | Convertible Preferred Stock | General Electric Company
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			15.00%
GE Transportation | General Electric Company | SpinCo Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)			8,700,000,000
GE Transportation | General Electric Company | SpinCo Class A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			15,000
GE Transportation | General Electric Company | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			10,000
GE Transportation | General Electric Company | SpinCo Class C Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			1
GE Transportation | General Electric Company | Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)							8,780
GE Transportation | General Electric Company | Common Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)							25,300,000
Number of shares issued in transaction (in shares)	2,048,515	16,969,656
GE Transportation | Pre-merger Wabtec Stockholders
Business Acquisition [Line Items]
Percentage of outstanding shares transferred			50.80%
GE Transportation | Wabtec | SpinCo Class B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			10,000
General Electric Company
Business Acquisition [Line Items]
Noncontrolling interest acquired			$ 88.3
Other noncurrent liabilities			666.5
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

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