Divestitures (Summary Of Components Of Income From Discontinued Operations Before Income Taxes) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 02, 2019	Mar. 31, 2019	Mar. 31, 2018	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
Global Battery And Lighting [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale	$ 996.3
Global Auto Care [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Write-down of assets of business held for sale to fair value less cost to sell				110.8
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]
Net sales			196.8	249.0	458.0
Cost of goods sold			121.0	164.6	291.2
Gross profit			75.8	84.4	166.8
Operating expenses		2.3	59.9	57.0	113.8
Operating (loss) income		(2.3)	15.9	27.4	53.0
Interest expense		10.0	11.9	23.3	25.2
Other non-operating expense, net			0.1	0.5	0.2
Gain on sale		(996.3)		(996.3)
Reclassification of accumulated other comprehensive income		18.5		18.5
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]
Net sales		22.1	118.3	87.7	187.2
Cost of goods sold		13.2	78.8	52.5	116.5
Gross profit		8.9	39.5	35.2	70.7
Operating expenses		8.0	27.3	35.7	52.3
Operating (loss) income		0.9	12.2	(0.5)	18.4
Interest expense		0.2	0.5	0.7	1.0
Other non-operating expense, net		0.1		0.2
Other non-operating income, net			(0.2)		(0.2)
Write-down of assets of business held for sale to fair value less cost to sell		3.5		110.8
Reclassification of accumulated other comprehensive income		3.3		3.3
Income (Loss) from discontinued operations before income taxes		$ (6.2)	$ 11.9	$ (115.5)	$ 17.6