Consolidating Financial Information - Schedule of Balance Sheet Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015
Condensed Balance Sheet [Line Items]
Document Period End Date	Jun. 30, 2017
Assets:
Cash and cash equivalents	$ 266.2	$ 465.2	$ 447.9	$ 643.2
Receivables, net	661.0	539.1
Inventories, net	843.7	740.6
Goodwill	2,621.3	2,478.4
Intangibles, net	2,453.4	2,372.5
Other assets	144.0	138.3
Disposal Group, Including Discontinued Operation, Assets, Current	27,811.7	26,284.3
Total assets	35,495.5	33,580.1
Liabilities and Equity:
Debt	5,906.6	5,359.8
Employee benefit obligations	117.1	125.4
Deferred tax liabilities	596.0	546.0
Disposal Group, Including Discontinued Operation, Liabilities, Current	25,870.9	24,553.8
Total liabilities	33,598.8	31,762.9
Total stockholders' equity	729.3	638.1
Noncontrolling interests	1,167.4	1,179.1
Total permanent equity	1,896.7	1,817.2
Total liabilities and equity	35,495.5	33,580.1
Consolidated Entities [Member]
Assets:
Cash and cash equivalents	266.2	465.2
Receivables, net	661.0	539.1
Inventories, net	843.7	740.6
Deferred tax assets	18.3	18.3
Property, plant and equipment, net	675.9	543.4
Goodwill	2,621.3	2,478.4
Intangibles, net	2,453.4	2,372.5
Other assets	144.0	138.3
Disposal Group, Including Discontinued Operation, Assets, Current	27,811.7	26,284.3
Total assets	35,495.5	33,580.1
Liabilities and Equity:
Debt	6,032.5	5,525.8
Accounts payable and other current liabilities	941.8	983.2
Employee benefit obligations	117.1	125.4
Deferred tax liabilities	596.0	546.0
Other liabilities	40.5	28.7
Disposal Group, Including Discontinued Operation, Liabilities, Current	25,870.9	24,553.8
Total liabilities	33,598.8	31,762.9
Total stockholders' equity	729.3	638.1
Noncontrolling interests	1,167.4	1,179.1
Total permanent equity	1,896.7	1,817.2
Total liabilities and equity	35,495.5	33,580.1
Consolidation, Eliminations [Member]
Assets:
Investments in subsidiaries and affiliates	(2,605.2)	(2,405.3)
Affiliated loans and receivables	(0.2)
Disposal Group, Including Discontinued Operation, Assets, Current	0.0	0.0
Total assets	(2,605.4)	(2,405.3)
Liabilities and Equity:
Debt	140.1	157.9
Affiliated debt and payables	(158.5)	(171.2)
Disposal Group, Including Discontinued Operation, Liabilities, Current	0.0	0.0
Total liabilities	(18.4)	(13.3)
Total stockholders' equity	(2,587.0)	(2,392.0)
Noncontrolling interests	0.0
Total permanent equity	(2,587.0)	(2,392.0)
Total liabilities and equity	(2,605.4)	(2,405.3)
Corporate and Other [Member]
Assets:
Investments in subsidiaries and affiliates	2,605.2	2,405.3
Affiliated loans and receivables	0.2
Cash and cash equivalents	156.3	189.9
Receivables, net	2.7	0.9
Property, plant and equipment, net	0.8	1.3
Other assets	2.9	34.6
Disposal Group, Including Discontinued Operation, Assets, Current	0.0	0.0
Total assets	2,768.1	2,632.0
Liabilities and Equity:
Debt	1,791.8	1,747.7
Accounts payable and other current liabilities	70.6	51.6
Employee benefit obligations	4.5	5.2
Deferred tax liabilities	12.1	13.3
Other liabilities	2.9	8.3
Affiliated debt and payables	158.5	171.2
Disposal Group, Including Discontinued Operation, Liabilities, Current	0.0	0.0
Total liabilities	2,040.4	1,997.3
Total stockholders' equity	729.3	638.1
Noncontrolling interests	(1.6)	(3.4)
Total permanent equity	727.7	634.7
Total liabilities and equity	2,768.1	2,632.0
Discontinued Operations, Held-for-sale [Member]
Assets:
Disposal Group, Including Discontinued Operation, Assets, Current	27,811.7	26,284.3
Total assets	27,811.7	26,284.3
Liabilities and Equity:
Disposal Group, Including Discontinued Operation, Liabilities, Current	25,870.9	24,553.8
Total liabilities	25,870.9	24,553.8
Total stockholders' equity	1,526.7	1,351.6
Noncontrolling interests	414.1	378.9
Total permanent equity	1,940.8	1,730.5
Total liabilities and equity	27,811.7	26,284.3
Consumer Products Segment [Member]
Assets:
Cash and cash equivalents	109.9	275.3
Receivables, net	658.3	538.2
Inventories, net	843.7	740.6
Deferred tax assets	18.3	18.3
Property, plant and equipment, net	675.1	542.1
Goodwill	2,621.3	2,478.4
Intangibles, net	2,453.4	2,372.5
Other assets	141.1	103.7
Disposal Group, Including Discontinued Operation, Assets, Current	0.0	0.0
Total assets	7,521.1	7,069.1
Liabilities and Equity:
Debt	4,100.6	3,620.2
Accounts payable and other current liabilities	871.2	931.6
Employee benefit obligations	112.6	120.2
Deferred tax liabilities	583.9	532.7
Other liabilities	37.6	20.4
Disposal Group, Including Discontinued Operation, Liabilities, Current	0.0	0.0
Total liabilities	5,705.9	5,225.1
Total stockholders' equity	1,060.3	1,040.4
Noncontrolling interests	754.9	803.6
Total permanent equity	1,815.2	1,844.0
Total liabilities and equity	$ 7,521.1	$ 7,069.1