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Discontinued Operations, Assets Held for Sale and Divestitures Schedule of Discontinued Operations Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net sales     $ 83.1
Cost of sales     62.8
Gross profit     20.3
Selling, general and administrative     17.2
Other charges     0.2
Total operating expenses     17.4
Operating income     2.9
Interest expense, net     0.0
Income before income taxes     2.9
Income tax expense     1.8
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax     1.1
Gain on sale, net of tax     67.9
Income from discontinued operations $ 0.0 $ 0.0 $ 69.0