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Divestitures (Summary Of Components Of Income From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									$ 859.2	$ 466.3	$ 466.1
Income tax (benefit) expense from discontinued operations									199.3	21.3	176.8
Net (loss) income from discontinued operations									659.9	445.0	289.3
Income from discontinued operations, net of tax attributable to noncontrolling interest										33.2	92.7
Net (loss) income from discontinued operations attributable to controlling interest	$ (39.3)	$ (1.2)	$ 783.6	$ (83.2)	$ (81.7)	$ 22.7	$ 3.7	$ 467.1	659.9	411.8	196.6
Discontinued Operations, Held-For-Sale [Member] | Global Battery And Lighting [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									974.9	21.8	84.5
Discontinued Operations, Held-For-Sale [Member] | Global Auto Care [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									$ (115.7)	(31.9)	94.5
Discontinued Operations, Held-For-Sale [Member] | HRG Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes										$ 476.4	$ 287.1

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