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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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