Divestitures (Summary Of Effect Change In HPC And Reclassification Of GAC) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	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
As Previously Reported [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		766.1		1,412.6
Cost of goods sold		494.8		898.6
Gross profit		271.3		514.0
Operating expenses		242.4		458.5
Operating (loss) income		28.9		55.5
Interest expense		67.6		143.1
Other non-operating income, net		(0.2)		(1.2)
Income (Loss) from discontinued operations before income taxes		(38.5)		(86.4)
Home And Personal Care [Member] | Effect Of HPC Reclassification From Held For Sale To Held And Used [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		231.0		573.0
Cost of goods sold		156.8		391.7
Gross profit		74.2		181.3
Operating expenses		59.6		135.5
Operating (loss) income		14.6		45.8
Interest expense		0.6		0.9
Other non-operating expense, net				0.3
Income (Loss) from discontinued operations before income taxes		14.0		44.6
Home And Personal Care [Member] | After HPC Reclassification [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		997.1		1,985.6
Cost of goods sold		651.6		1,290.3
Gross profit		345.5		695.3
Operating expenses		302.0		594.0
Operating (loss) income		43.5		101.3
Interest expense		68.2		144.0
Other non-operating income, net		(0.2)		(0.9)
Income (Loss) from discontinued operations before income taxes		(24.5)		(41.8)
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
Global Auto Care [Member] | Effect Of GAC Reclassification From Held And Used To Held For Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		114.5		180.7
Cost of goods sold		75.0		110.0
Gross profit		39.5		70.7
Operating expenses		27.3		52.3
Operating (loss) income		12.2		18.4
Interest expense		0.5		1.0
Other non-operating income, net		(0.2)		(0.2)
Income (Loss) from discontinued operations before income taxes		11.9		17.6
Global Auto Care [Member] | After GAC Reclassification [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		882.6		1,804.9
Cost of goods sold		576.6		1,180.3
Gross profit		306.0		624.6
Operating expenses		274.7		541.7
Operating (loss) income		31.3		82.9
Interest expense		67.7		143.0
Other non-operating income, net				(0.7)
Income (Loss) from discontinued operations before income taxes		$ (36.4)		$ (59.4)