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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

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