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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