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ACQUISITIONS - Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 12, 2019 | Aug. 09, 2019 | Feb. 25, 2019 | Mar. 22, 2018 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 06, 2019 | Apr. 30, 2019 | Feb. 22, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 191,699,193 | 96,614,946 |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  | 0 | 0 |  |  |  |
Acquisition payments |  |  |  |  |  | $ 10,115.7 | $ 58.9 | $ 1,006.2 |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  | 226,947,180 | 132,349,534 |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  | 0 | 0 |  |  |  |
Purchase price |  |  |  |  |  | $ 2,996.4 | $ 51.2 | $ 945.3 |  |  |
Goodwill |  |  |  |  |  | 8,360.6 | 2,396.5 |  |  |  |
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 |  |  |  |
Annax GmbH |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition payments |  |  |  |  | $ 10.1 |  |  |  |  |  |
Purchase price |  |  |  | $ 45.2 |  |  |  |  |  |  |
Goodwill |  |  |  | 38.5 |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  | 0.0 |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 11.7 |  |  |  |  |  |  |
Annax GmbH | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 3.8 |  |  |  |  |  |  |
Annax GmbH | Customer relationships |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | $ 7.5 |  |  |  |  |  |  |
Useful life of customer relationships (in years) |  |  |  | 20 years |  |  |  |  |  |  |
GE Transportation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 2,875.0 |  |  |  |  |  |  |  |
Acquisition payments |  |  | 470.0 |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 63.0 |  |  |  |  |
Revenues |  |  |  |  |  | 3,800.0 |  |  |  |  |
Operating income |  |  |  |  |  | 358.0 |  |  |  |  |
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 |  |  |  |  |  |  |  |
GET Brazil |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest acquired |  |  |  |  |  |  |  |  |  | $ 56.2 |
General Electric Company |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest acquired |  |  | $ 86.8 |  |  |  |  |  |  |  |
Change in estimated fair values for assets acquired |  |  |  |  |  | (92.1) |  |  |  |  |
Change in estimated fair value for liabilities acquired |  |  |  |  |  | $ 129.1 |  |  |  |  |
Other noncurrent liabilities |  |  | 652.9 |  |  |  |  |  |  |  |
Goodwill |  |  | 5,987.5 |  |  |  |  |  |  |  |
General Electric Company | Customer Contracts [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other noncurrent liabilities |  |  | $ 504.7 |  |  |  |  |  |  |  |

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