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Discontinued Operations - Additional Information (Details) - Discontinued Operations, Disposed of by Sale - Fairbanks Morse - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 21, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |
Proceeds from sale of investment projects | $ 450.0 |  |
The pre-tax gain on the disposition | $ 274.3 |  |
Income from discontinued operations before income taxes |  | $ (1.4) | $ 38.3
Adjustments |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |
Income from discontinued operations before income taxes |  |  | $ 2.4

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