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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
Dec. 31, 2017
Dec. 31, 2016
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
Operating expenses:    
Selling, general and administrative   18.3
Other charges   0.2
Total operating expenses   18.5
Operating income   1.8
Income tax expense   0.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ 0.0 $ 1.3