Segment Data - Segment Information (Detail) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Segment Reporting Information [Line Items]
Document Period End Date	Dec. 31, 2013
Revenues:
Consolidated revenues	$ 1,510,000,000	$ 1,222,300,000
Operating income (loss):
Consolidated operating income	179,300,000	215,400,000
Interest expense	(84,000,000)	(143,100,000)
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock	(47,200,000)	68,900,000
Gain on contingent purchase price reduction	500,000	0
Other expense, net	(11,900,000)	(8,700,000)
Income from continuing operations before income taxes	36,700,000	132,500,000
Total assets:
Consolidated total assets	28,764,000,000		27,908,800,000
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(89,400,000)	(155,300,000)
Consumer Products Segment [Member]
Revenues:
Consolidated revenues	1,100,600,000	870,300,000
Operating income (loss):
Consolidated operating income	125,000,000	68,200,000
Interest expense	(57,000,000)
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock
Gain on contingent purchase price reduction	0
Other expense, net	(900,000)	(1,600,000)
Income from continuing operations before income taxes	67,100,000	(3,300,000)
Total assets:
Consolidated total assets	5,649,800,000		5,626,700,000
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(136,000,000)	(169,600,000)
Insurance [Member]
Revenues:
Consolidated revenues	373,100,000	343,600,000
Operating income (loss):
Consolidated operating income	85,300,000	163,600,000
Interest expense	(5,600,000)
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock
Gain on contingent purchase price reduction	0
Other expense, net		200,000
Income from continuing operations before income taxes	79,700,000	164,500,000
Total assets:
Consolidated total assets	21,888,200,000		21,183,100,000
Total cash provided from operating activities:
Consolidated cash provided from operating activities	58,800,000	67,600,000
Energy Segment [Member]
Revenues:
Consolidated revenues	35,500,000	0
Operating income (loss):
Consolidated operating income	6,000,000	0
Interest expense	(2,400,000)
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock
Gain on contingent purchase price reduction	0
Other expense, net	(3,400,000)
Income from continuing operations before income taxes	(2,100,000)
Total assets:
Consolidated total assets	597,200,000		617,600,000
Total cash provided from operating activities:
Consolidated cash provided from operating activities	7,200,000	0
Financial Services segment [Member]
Revenues:
Consolidated revenues	4,500,000	8,400,000
Total assets:
Consolidated total assets	691,700,000		572,200,000
Total cash provided from operating activities:
Consolidated cash provided from operating activities	5,400,000	1,900,000
Other Financial Services [Member]
Revenues:
Consolidated revenues	4,500,000	8,400,000
Operating income (loss):
Consolidated operating income	(3,900,000)	5,100,000
Interest expense
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock
Gain on contingent purchase price reduction	0
Other expense, net	(3,700,000)
Income from continuing operations before income taxes	(9,000,000)	4,400,000
Total assets:
Consolidated total assets	691,700,000		572,200,000
Total segments [Member]
Operating income (loss):
Consolidated operating income	208,700,000	236,900,000
Total assets:
Consolidated total assets	28,390,800,000		27,538,200,000
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(64,600,000)	(100,100,000)
Intersegment elimination [Member]
Revenues:
Consolidated revenues	(3,700,000)	0
Operating income (loss):
Consolidated operating income	(3,700,000)	0
Interest expense		(107,200,000)
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock
Gain on contingent purchase price reduction	0
Other expense, net
Income from continuing operations before income taxes	(71,500,000)	(107,200,000)
Total assets:
Consolidated total assets	(436,100,000)		(461,400,000)
Corporate expenses [Member]
Revenues:
Consolidated revenues
Operating income (loss):
Consolidated operating income	(29,400,000)	(21,500,000)
Interest expense	(19,000,000)	107,200,000
(Loss) gain from the change in the fair value of the equity conversion feature of preferred stock	(47,200,000)	68,900,000
Gain on contingent purchase price reduction	500,000
Other expense, net	(3,900,000)	(7,300,000)
Income from continuing operations before income taxes	(27,500,000)	74,100,000
Total assets:
Consolidated total assets	2,310,700,000		2,383,500,000
Corporate assets [Member]
Total assets:
Consolidated total assets	373,200,000		370,600,000
Corporate Segment [Member]
Total cash provided from operating activities:
Consolidated cash provided from operating activities	$ (24,800,000)	$ (55,200,000)