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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, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net sales                 $ 83.1 $ 338.3 $ 371.1
Cost of sales                 62.8 241.9 270.1
Gross profit                 20.3 96.4 101.0
Selling, general and administrative                 17.2 67.6 69.7
Other charges                 0.2 1.1 1.3
Total operating expenses                 17.4 68.7 71.0
Operating income                 2.9 27.7 30.0
Interest expense, net                 0.0 0.0 0.1
Income before income taxes                 2.9 27.7 29.9
Income before income taxes     $ (109.5)                
Income tax expense                 1.8 8.9 11.5
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax                 1.1 18.8 18.4
Gain on sale, net of tax                 67.9 0.0 0.0
Income from discontinued operations $ (0.8) $ (0.1) $ 68.6 $ 1.3 $ 6.7 $ 4.5 $ 5.4 $ 2.2 $ 69.0 $ 18.8 $ 18.4