Divestitures (Summary Of Components Of Income From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2019	Dec. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations before income taxes	$ 959.3		$ 15.8		$ 865.9	$ 521.6
Income tax expense from discontinued operations	175.7		4.5		165.5	28.9
Net (loss) income from discontinued operations	783.6	$ (83.2)	11.3	$ 481.6	700.4	492.7
Income from discontinued operations, net of tax attributable to noncontrolling interest			7.6			21.7
Net (loss) income from discontinued operations attributable to controlling interest	783.6		3.7		700.4	471.0
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]
Income (loss) from discontinued operations before income taxes	965.5		3.9		981.4	27.6
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]
Income (loss) from discontinued operations before income taxes	$ (6.2)		$ 11.9		$ (115.5)	17.6
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]
Income (loss) from discontinued operations before income taxes						$ 476.4