Segment and Georgraphic Data - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									$ 558.2	$ 300.3	$ 476.9
Revenues:
Consolidated segment revenues									5,215.4	4,709.7	4,634.7
Depreciation and amortization									183.7	171.0	158.2
Operating income (loss):
Consolidated operating income									628.0	45.8	427.4
Interest expense									(397.1)	(401.6)	(298.8)
Loss from the change in the fair value of the equity conversion feature of preferred stock										0.0	(12.7)
Deconsolidation, Gain (Loss), Amount									0.0	38.5	0.0
Other income (expense), net									1.0	10.2	(11.9)
Income (loss) from continuing operations before income taxes									231.9	(307.1)	104.0
Capital expenditures									95.4	90.6	75.5
Total assets:
Assets	$ 35,792.8				$ 35,031.5				35,792.8	35,031.5
Net change in cash due to operating activities
Net sales to external customers	1,249.7	$ 1,361.6	$ 1,209.6	$ 1,218.8	1,308.1	$ 1,249.7	$ 1,086.5	$ 1,088.8	5,039.7	4,733.1	4,449.2
Long-Lived Assets	543.4				509.5				543.4	509.5
Income tax expense (benefit)									41.5	(16.2)	89.6
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(9.6)	141.5	56.5	2.0	(95.0)	(24.7)	(85.1)	(86.1)	190.4	(290.9)	14.4
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	45.8	(234.5)	(40.6)	5.0	(32.1)	(16.7)	(152.4)	(20.3)	(224.3)	(221.5)	87.3
Net (loss) income	36.2	(93.0)	15.9	7.0	(127.1)	(41.4)	(237.5)	(106.4)	(33.9)	(512.4)	101.7
Less: Net income attributable to noncontrolling interest									164.9	44.4	112.0
Net Income (Loss) Attributable to Parent	(7.3)	$ (132.9)	$ (24.7)	$ (33.9)	(143.1)	$ (75.6)	$ (228.3)	$ (109.8)	(198.8)	(556.8)	(10.3)
Consumer Products Segment
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									615.0	444.9	432.7
Revenues:
Consolidated segment revenues									5,039.7	4,690.4	4,429.1
Depreciation and amortization									183.0	170.0	157.7
Operating income (loss):
Consolidated operating income									656.3	474.1	481.9
Interest expense									(250.0)	(271.9)	(202.1)
Loss from the change in the fair value of the equity conversion feature of preferred stock											0.0
Deconsolidation, Gain (Loss), Amount										0.0
Other income (expense), net									(8.6)	(8.9)	(6.3)
Income (loss) from continuing operations before income taxes									397.7	193.3	273.5
Capital expenditures									95.2	89.1	73.4
Total assets:
Assets	7,069.1				7,193.8				7,069.1	7,193.8
Net change in cash due to operating activities
Net sales to external customers									5,039.7	4,690.4	4,429.1
Long-Lived Assets	542.1				507.1				542.1	507.1
Income tax expense (benefit)									40.0	43.9	59.0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0.0	0.0	0.0
Net (loss) income									357.7	149.4	214.5
Less: Net income attributable to noncontrolling interest									151.1	62.7	88.9
Net Income (Loss) Attributable to Parent									206.6	86.7	125.6
Insurance Segment [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									(12.3)	(51.2)	(18.3)
Revenues:
Consolidated segment revenues									150.4	(98.8)	144.3
Operating income (loss):
Consolidated operating income									(12.4)	(68.7)	40.1
Interest expense											0.0
Loss from the change in the fair value of the equity conversion feature of preferred stock											0.0
Deconsolidation, Gain (Loss), Amount										0.0
Other income (expense), net											0.0
Income (loss) from continuing operations before income taxes									(12.4)	(68.7)	40.1
Total assets:
Assets	1,824.9				1,883.8				1,824.9	1,883.8
Net change in cash due to operating activities
Income tax expense (benefit)									(2.4)	(24.0)	15.7
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0.0	0.0	0.0
Net (loss) income									(10.0)	(44.7)	24.4
Less: Net income attributable to noncontrolling interest											0.0
Net Income (Loss) Attributable to Parent									(10.0)	(44.7)	24.4
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									142.6	91.1	231.6
Revenues:
Consolidated segment revenues									16.4	54.7	7.8
Operating income (loss):
Consolidated operating income									68.1	(62.9)	32.5
Interest expense									(4.0)	(5.5)	(7.0)
Loss from the change in the fair value of the equity conversion feature of preferred stock											0.0
Deconsolidation, Gain (Loss), Amount										0.0
Other income (expense), net									(1.5)	(10.7)	(0.2)
Income (loss) from continuing operations before income taxes									31.8	182.9	(210.7)
Net change in cash due to operating activities
Income tax expense (benefit)									(15.0)	(18.6)	13.7
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0.0	0.0	0.0
Net (loss) income									46.8	201.5	(224.4)
Less: Net income attributable to noncontrolling interest											0.0
Net Income (Loss) Attributable to Parent									46.8	201.5	(224.4)
Total segments
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									745.3	484.8	646.0
Revenues:
Consolidated segment revenues									5,206.5	4,646.3	4,581.2
Operating income (loss):
Consolidated operating income									712.0	342.5	554.5
Corporate Segment
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									(187.1)	(184.5)	(169.1)
Revenues:
Depreciation and amortization									0.7	1.0	0.5
Operating income (loss):
Capital expenditures									0.2	1.5	2.1
Corporate expenses
Revenues:
Consolidated segment revenues									8.9	63.4	53.5
Operating income (loss):
Consolidated operating income									(84.0)	(296.7)	(127.1)
Interest expense									(143.1)	(124.2)	(89.7)
Loss from the change in the fair value of the equity conversion feature of preferred stock											(12.7)
Deconsolidation, Gain (Loss), Amount										38.5
Other income (expense), net									11.1	29.8	(5.4)
Income (loss) from continuing operations before income taxes									(185.2)	(614.6)	1.1
Total assets:
Assets	2,632.0				2,833.9				2,632.0	2,833.9
Net change in cash due to operating activities
Net sales to external customers										42.7	20.1
Income tax expense (benefit)									18.9	(17.5)	1.2
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0.0	0.0	0.0
Net (loss) income									(204.1)	(597.1)	(0.1)
Less: Net income attributable to noncontrolling interest									(5.3)	(40.3)	10.2
Net Income (Loss) Attributable to Parent									(198.8)	(556.8)	(10.3)
Corporate assets
Net change in cash due to operating activities
Long-Lived Assets	1.3				2.4				1.3	2.4
UNITED STATES
Operating income (loss):
Income (loss) from continuing operations before income taxes									31.7	(497.1)	(100.0)
Net change in cash due to operating activities
Net sales to external customers									3,217.9	2,950.6	2,660.8
Long-Lived Assets	323.4				313.5				323.4	313.5
Outside of the United States [Member]
Operating income (loss):
Income (loss) from continuing operations before income taxes									200.2	190.0	204.0
Net change in cash due to operating activities
Net sales to external customers									1,821.8	1,782.5	$ 1,788.4
Long-Lived Assets	$ 220.0				$ 196.0				$ 220.0	$ 196.0