Consolidating Financial Information - Schedule of Balance Sheet Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Condensed Balance Sheet [Line Items]
Document Period End Date	Sep. 30, 2017
Accounts Payable and Other Accrued Liabilities, Current	$ 1,115.6	$ 983.2
Other Accrued Liabilities, Current	215.4	188.5
Assets:
Cash and cash equivalents	270.1	465.2	$ 643.2	$ 673.6
Other receivables, net (Note 8)	569.8	539.1
Inventories, net (Note 9)	775.5	740.6
Deferred tax assets (Note 19)	342.8	743.4
Goodwill (Note 12)	2,626.0	2,478.4	2,487.4
Intangibles, net (Note 11)	2,424.0	2,372.5	2,480.3
Other assets	137.2	138.3
Disposal Group, Including Discontinued Operation, Assets, Current	28,326.2	26,284.3
Assets	35,849.7	33,580.1
Liabilities and Equity:
Short-term Debt	178.7	258.0
Long-term Debt, Excluding Current Maturities	5,595.4	5,267.8
Employee benefit obligations (Note 17)	87.5	125.4
Deferred tax liabilities (Note 18)	531.4	546.0
Disposal Group, Including Discontinued Operation, Liabilities, Current	26,350.7	24,553.8
Liabilities	33,902.8	31,762.9
Stockholders' Equity Attributable to Parent	758.0	638.1
Noncontrolling interests	1,188.9	1,179.1
Total permanent equity	1,946.9	1,817.2	$ 1,588.1	$ 2,257.0
Total liabilities and equity	35,849.7	33,580.1
Consumer Products Segment
Assets:
Cash and cash equivalents	168.2	275.3
Other receivables, net (Note 8)	569.5	538.2
Inventories, net (Note 9)	775.5	740.6
Deferred tax assets (Note 19)	20.2	18.3
Property, Plant and Equipment including Oil and Gas Property, Net	699.9	542.1
Goodwill (Note 12)	2,626.0	2,478.4
Intangibles, net (Note 11)	2,424.0	2,372.5
Other assets	136.4	103.7
Disposal Group, Including Discontinued Operation, Assets, Current	0.0	0.0
Assets	7,419.7	7,069.1
Liabilities and Equity:
Long-term Debt, Excluding Current Maturities	3,840.7	3,620.2
Accounts payable and other current liabilities	1,076.7	931.6
Employee benefit obligations (Note 17)	83.3	120.2
Deferred tax liabilities (Note 18)	531.4	532.7
Other liabilities	40.9	20.4
Disposal Group, Including Discontinued Operation, Liabilities, Current		0.0
Liabilities	5,573.0	5,225.1
Stockholders' Equity Attributable to Parent	1,095.4	1,040.4
Noncontrolling interests	751.3	803.6
Total permanent equity	1,846.7	1,844.0
Total liabilities and equity	7,419.7	7,069.1
Corporate and Other [Member]
Assets:
Investments in subsidiaries and affiliates	2,631.7	2,405.3
Cash and cash equivalents	101.9	189.9
Other receivables, net (Note 8)	0.3	0.9
Property, Plant and Equipment including Oil and Gas Property, Net	0.8	1.3
Other assets	0.8	34.6
Assets	2,735.5	2,632.0
Liabilities and Equity:
Long-term Debt, Excluding Current Maturities	1,793.3	1,747.7
Accounts payable and other current liabilities	38.3	51.6
Employee benefit obligations (Note 17)	4.2	5.2
Deferred tax liabilities (Note 18)	0.0	13.3
Other liabilities	2.6	8.3
Affiliated debt and payables	140.7	171.2
Disposal Group, Including Discontinued Operation, Liabilities, Current	0.0	0.0
Liabilities	1,979.1	1,997.3
Stockholders' Equity Attributable to Parent	758.0	638.1
Noncontrolling interests	(1.6)	(3.4)
Total permanent equity	756.4	634.7
Total liabilities and equity	2,735.5	2,632.0
Discontinued Operations, Held-for-sale [Member]
Assets:
Other receivables, net (Note 8)	0.0	0.0
Disposal Group, Including Discontinued Operation, Assets, Current	28,326.2	26,284.3
Assets	28,326.2	26,284.3
Liabilities and Equity:
Long-term Debt, Excluding Current Maturities	0.0	0.0
Employee benefit obligations (Note 17)	0.0
Deferred tax liabilities (Note 18)	0.0
Other liabilities	0.0
Affiliated debt and payables	0.0
Disposal Group, Including Discontinued Operation, Liabilities, Current	26,350.7	24,553.8
Liabilities	26,350.7	24,553.8
Stockholders' Equity Attributable to Parent	1,536.3	1,351.6
Noncontrolling interests	439.2	378.9
Total permanent equity	1,975.5	1,730.5
Total liabilities and equity	28,326.2	26,284.3
Consolidation, Eliminations
Assets:
Investments in subsidiaries and affiliates	(2,631.7)	(2,405.3)
Other receivables, net (Note 8)	0.0	0.0
Disposal Group, Including Discontinued Operation, Assets, Current	0.0	0.0
Assets	(2,631.7)	(2,405.3)
Liabilities and Equity:
Long-term Debt, Excluding Current Maturities	140.1	157.9
Accounts payable and other current liabilities	0.6
Employee benefit obligations (Note 17)	0.0
Deferred tax liabilities (Note 18)	0.0
Other liabilities	0.0
Affiliated debt and payables	(140.7)	(171.2)
Disposal Group, Including Discontinued Operation, Liabilities, Current	0.0	0.0
Liabilities	0.0	(13.3)
Stockholders' Equity Attributable to Parent	(2,631.7)	(2,392.0)
Noncontrolling interests	0.0
Total permanent equity	(2,631.7)	(2,392.0)
Total liabilities and equity	(2,631.7)	(2,405.3)
Consolidated Entities
Assets:
Cash and cash equivalents	270.1	465.2
Other receivables, net (Note 8)	569.8	539.1
Inventories, net (Note 9)	775.5	740.6
Deferred tax assets (Note 19)	20.2	18.3
Property, Plant and Equipment including Oil and Gas Property, Net	700.7	543.4
Goodwill (Note 12)	2,626.0	2,478.4
Intangibles, net (Note 11)	2,424.0	2,372.5
Other assets	137.2	138.3
Disposal Group, Including Discontinued Operation, Assets, Current	28,326.2	26,284.3
Assets	35,849.7	33,580.1
Liabilities and Equity:
Long-term Debt, Excluding Current Maturities	5,774.1	5,525.8
Accounts payable and other current liabilities	1,115.6	983.2
Employee benefit obligations (Note 17)	87.5	125.4
Deferred tax liabilities (Note 18)	531.4	546.0
Other liabilities	43.5	28.7
Affiliated debt and payables	0.0
Disposal Group, Including Discontinued Operation, Liabilities, Current	26,350.7	24,553.8
Liabilities	33,902.8	31,762.9
Stockholders' Equity Attributable to Parent	758.0	638.1
Noncontrolling interests	1,188.9	1,179.1
Total permanent equity	1,946.9	1,817.2
Total liabilities and equity	35,849.7	$ 33,580.1
Asset Management segment [Member]
Condensed Balance Sheet [Line Items]
Fair Value, Net Asset (Liability)	$ 67.4