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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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