Segment Data - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ (227.5)	$ (263.4)
Revenues:
Consolidated revenues	1,226.2	1,141.8
Operating income (loss):
Consolidated operating income	35.3	(215.0)
Interest expense	(97.5)	(76.4)
Gain (Loss) on Disposition of Oil and Gas Property	105.6	0.0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	0.0	141.2
Other income, net	1.1	32.8
(Loss) income from continuing operations before income taxes	44.5	(117.4)
Total assets:
Consolidated total assets	35,032.8		$ 35,034.0
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(88.9)	(174.7)
Income tax expense	1.9	6.0
Net (loss) income	7.0	(106.4)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	42.6	(123.4)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(35.6)	17.0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(35.6)	17.0
Net Income (Loss) Attributable to Parent	(33.9)	(109.8)
Less: Net income attributable to noncontrolling interest	40.9	3.4
Total segments [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(205.2)	(186.3)
Revenues:
Consolidated revenues	1,226.2	1,120.8
Operating income (loss):
Consolidated operating income	49.9	(91.2)
Intersegment elimination [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	46.2	(37.1)
Revenues:
Consolidated revenues	(5.4)	(23.8)
Operating income (loss):
Consolidated operating income	(19.0)	(16.2)
Interest expense	(1.1)	(1.7)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Other income, net	(0.2)	(2.2)
(Loss) income from continuing operations before income taxes	(16.1)	(4.7)
Total cash provided from operating activities:
Income tax expense	(3.7)	(3.2)
Net (loss) income	(12.4)	(1.5)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net Income (Loss) Attributable to Parent	(12.4)	(1.5)
Other Financial Services [Member]
Operating income (loss):
Gain on contingent purchase price reduction		0.0
Asset Management segment [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(7.9)	(8.1)
Revenues:
Consolidated revenues	6.0	8.0
Operating income (loss):
Consolidated operating income	(9.1)	(1.2)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Other income, net	0.1	(0.5)
(Loss) income from continuing operations before income taxes	(12.1)	(3.2)
Total assets:
Consolidated total assets	241.2		334.5
Total cash provided from operating activities:
Net (loss) income	(12.1)	(3.2)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net Income (Loss) Attributable to Parent	(12.3)	(2.9)
Less: Net income attributable to noncontrolling interest	0.2	(0.3)
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(8.5)	4.4
Revenues:
Consolidated revenues	16.8	34.3
Operating income (loss):
Consolidated operating income	(64.5)	(195.0)
Interest expense	(2.3)	(2.2)
Gain (Loss) on Disposition of Oil and Gas Property	105.6
Gain on contingent purchase price reduction		141.2
Other income, net	1.8	18.8
(Loss) income from continuing operations before income taxes	38.3	(39.5)
Total assets:
Consolidated total assets	179.9		343.3
Total cash provided from operating activities:
Net (loss) income	38.3	(39.5)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net Income (Loss) Attributable to Parent	38.1	(39.2)
Less: Net income attributable to noncontrolling interest	0.2	(0.3)
Insurance Segment [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(11.8)	1.0
Revenues:
Consolidated revenues	(10.0)	34.5
Operating income (loss):
Consolidated operating income	0.0	5.6
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
(Loss) income from continuing operations before income taxes	(12.3)	2.7
Total assets:
Consolidated total assets	1,834.2		1,883.8
Total cash provided from operating activities:
Income tax expense	(1.3)	2.0
Net (loss) income	(11.0)	0.7
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net Income (Loss) Attributable to Parent	(11.0)	0.7
Consumer Products Segment [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(223.2)	(146.5)
Revenues:
Consolidated revenues	1,218.8	1,067.8
Operating income (loss):
Consolidated operating income	142.5	115.6
Interest expense	(58.4)	(44.4)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Other income, net	(3.5)	(0.7)
(Loss) income from continuing operations before income taxes	80.6	70.5
Total assets:
Consolidated total assets	7,165.6		7,193.8
Total cash provided from operating activities:
Income tax expense	6.9	20.5
Net (loss) income	73.7	50.0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net Income (Loss) Attributable to Parent	42.6	29.2
Less: Net income attributable to noncontrolling interest	31.1	20.8
Corporate expenses [Member]
Revenues:
Consolidated revenues		21.0
Operating income (loss):
Consolidated operating income	(14.6)	(123.8)
Interest expense	(35.7)	(28.1)
Gain (Loss) on Disposition of Oil and Gas Property	0.0
Gain on contingent purchase price reduction		0.0
Other income, net	2.9	17.4
(Loss) income from continuing operations before income taxes	(33.9)	(143.2)
Total assets:
Consolidated total assets	2,519.1		$ 2,355.5
Total cash provided from operating activities:
Income tax expense		(13.3)
Net (loss) income	(33.9)	(129.9)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.0
Net Income (Loss) Attributable to Parent	(33.9)	(109.8)
Less: Net income attributable to noncontrolling interest		(20.1)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ (22.3)	$ (77.1)