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Discontinued Operations, Assets Held for Sale and Divestitures Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Dec. 04, 2017	Jan. 06, 2017
Disposal Group, Including Discontinued Operation, Consideration						$ 305.7
Gain (Loss) on Disposition of Property Plant Equipment	$ 9.0	$ 2.5	$ 9.0	$ 0.0
Cash [Member]
Disposal Group, Including Discontinued Operation, Consideration					$ 7.4
Prepaid Expenses and Other Current Assets [Member]
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets					0.8
Property, Plant and Equipment [Member]
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment					0.4
Environmental Remediation [Member]
Disposal Group, Including Discontinued Operation, Consideration					$ 1.2

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