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Discontinued Operations, Assets Held for Sale and Divestitures (Schedule of Disposal Groups, Including Discontinued Operations - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net sales   $ 0.0   $ 83.1
Cost of sales   0.0   62.8
Gross profit   0.0   20.3
Operating expenses:        
Selling, general and administrative   0.1   17.0
Other charges   0.0   0.2
Total operating expenses   0.1   17.2
Operating income   (0.1)   3.1
Income tax expense   0.0   1.2
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax   (0.1)   1.9
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax   0.0   67.9
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ 0.0 $ (0.1) $ 0.0 $ 69.8