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Discontinued Operations - Results of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating expenses:      
Income from discontinued operations, net of taxes $ 0.0 $ 208.1 $ 30.5
Discontinued Operations, Disposed of by Sale | Fairbanks Morse      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations      
Net sales   7.6 284.2
Cost of sales   7.6 216.9
Gross profit   0.0 67.3
Operating expenses:      
Selling, general, and administrative expenses   1.5 28.2
Other   (0.1)  
Other     0.8
Total operating expenses   1.4 29.0
Income (loss) from discontinued operations before income taxes   (1.4) 38.3
Income tax benefit (expense)   0.3 (7.8)
Income (loss) from discontinued operations, net of taxes before gain from sale of discontinued operations   (1.1) 30.5
Gain from sale of discontinued operations, net of taxes   209.2 0.0
Income from discontinued operations, net of taxes   $ 208.1 $ 30.5