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Discontinued Operations, Assets Held for Sale and Divestitures Schedule of Discontinued Operations Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 83.1 | $ 338.3
Cost of sales |  |  |  |  |  | 62.8 | 241.9
Gross profit |  |  |  |  |  | 20.3 | 96.4
Selling, general and administrative |  |  |  |  |  | 17.2 | 67.6
Other charges |  |  |  |  |  | 0.2 | 1.1
Total operating expenses |  |  |  |  |  | 17.4 | 68.7
Operating income |  |  |  |  |  | 2.9 | 27.7
Interest expense, net |  |  |  |  |  | 0.0 | 0.0
Income before income taxes |  |  |  |  |  | 2.9 | 27.7
Income before income taxes |  |  | $ (109.5) |  |  |  |
Income tax expense |  |  |  |  |  | 1.8 | 8.9
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  | 1.1 | 18.8
Gain on sale, net of tax |  |  |  |  |  | 67.9 | 0.0
Income from discontinued operations | $ (0.8) | $ (0.1) | $ 68.6 | $ 1.3 | $ 0.0 | $ 69.0 | $ 18.8

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