Consolidating Financial Information - Schedule of Income Statement Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Net consumer and other product sales	$ 1,218.8	$ 1,088.8
Oil and natural gas	16.8	34.3
Net investment income	20.3	24.1
Net investment losses	(32.0)	(6.5)
Insurance and investment product fees and other	2.3	1.1
Revenues	1,226.2	1,141.8
Operating costs and expenses:
Cost of consumer products and other goods sold	778.1	712.0
Oil and natural gas direct operating costs	17.1	20.5
Benefits and other changes in policy reserves	0.8	17.8
Selling, acquisition, operating and general expenses	308.1	336.2
Asset Impairment Charges	63.2	249.8
Amortization of intangibles	23.6	20.5
Total operating costs and expenses	1,190.9	1,356.8
Operating income	35.3	(215.0)
Interest expense	(97.5)	(76.4)
Other income, net	1.1	32.8
Income (loss) from continuing operations before income taxes	44.5	(117.4)
Income tax expense	1.9	6.0
Income (Loss) from Continuing Operations Attributable to Parent	11.1	(123.5)
Net income (loss)	7.0	(106.4)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(35.6)	17.0
Less: Net income attributable to noncontrolling interest	40.9	3.4
Net income (loss) attributable to controlling interest	(33.9)	(109.8)
Net income (loss) attributable to common and participating preferred stockholders	(33.9)	(109.8)
Gain (Loss) on Disposition of Oil and Gas Property	105.6	0.0
Consolidated Entities [Member]
Revenues:
Net consumer and other product sales	1,218.8	1,088.8
Oil and natural gas		34.3
Net investment income	20.3	24.1
Net investment losses	(32.0)	(6.5)
Insurance and investment product fees and other	2.3	1.1
Revenues	1,226.2	1,141.8
Operating costs and expenses:
Cost of consumer products and other goods sold	778.1	712.0
Oil and natural gas direct operating costs		20.5
Benefits and other changes in policy reserves	0.8	17.8
Selling, acquisition, operating and general expenses	308.1	336.2
Asset Impairment Charges	63.2	249.8
Amortization of intangibles	23.6	20.5
Total operating costs and expenses	1,190.9	1,356.8
Operating income	35.3	(215.0)
Interest expense	(97.5)	(76.4)
Other income, net	1.1	32.8
Income (loss) from continuing operations before income taxes	44.5
Income tax expense	1.9	6.0
Income (Loss) from Continuing Operations Attributable to Parent		(123.4)
Net income (loss)	42.6
Less: Net income attributable to noncontrolling interest	40.9	3.4
Net income (loss) attributable to controlling interest	(33.9)	(109.8)
Gain (Loss) on Disposition of Oil and Gas Property	105.6
Gain on contingent purchase price reduction		141.2
Intersegment elimination [Member]
Revenues:
Net investment income	14.3	13.2
Net investment losses	(20.3)	(38.1)
Insurance and investment product fees and other	0.6	1.1
Revenues	(5.4)	(23.8)
Operating costs and expenses:
Benefits and other changes in policy reserves	13.2	(8.6)
Selling, acquisition, operating and general expenses		1.0
Asset Impairment Charges	0.4
Total operating costs and expenses	13.6	(7.6)
Operating income	(19.0)	(16.2)
Equity in net income (losses) of subsidiaries	(1.2)	10.4
Interest expense	(1.1)	(1.7)
Affiliated interest income	(5.4)	(5.0)
Other income, net	(0.2)	(2.2)
Income (loss) from continuing operations before income taxes	(16.1)	(4.7)
Income tax expense	(3.7)	(3.2)
Income (Loss) from Continuing Operations Attributable to Parent		(1.5)
Net income (loss)	(12.4)	(1.5)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net income (loss) attributable to controlling interest	(12.4)	(1.5)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Corporate and Other [Member]
Revenues:
Net consumer and other product sales		21.0
Revenues		21.0
Operating costs and expenses:
Cost of consumer products and other goods sold		14.4
Selling, acquisition, operating and general expenses	14.6	70.2
Asset Impairment Charges		60.2
Total operating costs and expenses	14.6	144.8
Operating income	(14.6)	(123.8)
Equity in net income (losses) of subsidiaries	13.5	(7.5)
Interest expense	(35.7)	(28.1)
Affiliated interest income		1.2
Other income, net	2.9	17.4
Income (loss) from continuing operations before income taxes	(33.9)	(143.2)
Income tax expense		(13.3)
Net income (loss)	(33.9)	(129.9)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Less: Net income attributable to noncontrolling interest		(20.1)
Net income (loss) attributable to controlling interest	(33.9)	(109.8)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Discontinued Operations, Held-for-sale [Member]
Operating costs and expenses:
Operating income	0.0	0.0
Net income (loss)	(35.6)	17.0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(35.6)	17.0
Less: Net income attributable to noncontrolling interest	9.4	3.3
Net income (loss) attributable to controlling interest	(45.0)	13.7
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Other Financial Services [Member]
Operating costs and expenses:
Gain on contingent purchase price reduction		0.0
Asset Management segment [Member]
Revenues:
Net investment income	5.1	8.0
Insurance and investment product fees and other	0.9
Revenues	6.0	8.0
Operating costs and expenses:
Selling, acquisition, operating and general expenses	6.7	9.6
Asset Impairment Charges	8.4	(0.4)
Total operating costs and expenses	15.1	9.2
Operating income	(9.1)	(1.2)
Affiliated interest income	3.1	1.5
Other income, net	0.1	(0.5)
Income (loss) from continuing operations before income taxes	(12.1)	(3.2)
Net income (loss)	(12.1)	(3.2)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Less: Net income attributable to noncontrolling interest	0.2	(0.3)
Net income (loss) attributable to controlling interest	(12.3)	(2.9)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Energy Segment [Member]
Revenues:
Oil and natural gas	16.8	34.3
Revenues	16.8	34.3
Operating costs and expenses:
Oil and natural gas direct operating costs	17.1	20.5
Selling, acquisition, operating and general expenses	9.8	18.8
Asset Impairment Charges	54.4	190.0
Total operating costs and expenses	81.3	229.3
Operating income	(64.5)	(195.0)
Interest expense	(2.3)	(2.2)
Affiliated interest income	2.3	2.3
Other income, net	1.8	18.8
Income (loss) from continuing operations before income taxes	38.3	(39.5)
Net income (loss)	38.3	(39.5)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Less: Net income attributable to noncontrolling interest	0.2	(0.3)
Net income (loss) attributable to controlling interest	38.1	(39.2)
Gain (Loss) on Disposition of Oil and Gas Property	105.6
Gain on contingent purchase price reduction		141.2
Insurance Segment [Member]
Revenues:
Net investment income	0.9	2.9
Net investment losses	(11.7)	31.6
Insurance and investment product fees and other	0.8
Revenues	(10.0)	34.5
Operating costs and expenses:
Benefits and other changes in policy reserves	(12.4)	26.4
Selling, acquisition, operating and general expenses	2.4	2.5
Total operating costs and expenses	(10.0)	28.9
Operating income	0.0	5.6
Equity in net income (losses) of subsidiaries	(12.3)	(2.9)
Income (loss) from continuing operations before income taxes	(12.3)	2.7
Income tax expense	(1.3)	2.0
Net income (loss)	(11.0)	0.7
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net income (loss) attributable to controlling interest	(11.0)	0.7
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Consumer Products Segment [Member]
Revenues:
Net consumer and other product sales	1,218.8	1,067.8
Revenues	1,218.8	1,067.8
Operating costs and expenses:
Cost of consumer products and other goods sold	778.1	697.6
Selling, acquisition, operating and general expenses	274.6	234.1
Amortization of intangibles	23.6	20.5
Total operating costs and expenses	1,076.3	952.2
Operating income	142.5	115.6
Interest expense	(58.4)	(44.4)
Other income, net	(3.5)	(0.7)
Income (loss) from continuing operations before income taxes	80.6	70.5
Income tax expense	6.9	20.5
Net income (loss)	73.7	50.0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Less: Net income attributable to noncontrolling interest	31.1	20.8
Net income (loss) attributable to controlling interest	42.6	29.2
Gain (Loss) on Disposition of Oil and Gas Property	$ 0.0
Gain on contingent purchase price reduction		$ 0.0