Segment Data - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016
Segment Reporting Information [Line Items]
Document Fiscal Year Focus			2017
Net Cash Provided by (Used in) Operating Activities, Continuing Operations			$ (22.7)	$ (177.9)
Revenues:
Consolidated revenues	$ 1,216.1	$ 1,267.3	2,405.7	2,476.7
Operating income (loss):
Consolidated operating income	143.5	142.5	261.2	242.3
Interest expense	(88.3)	(94.4)	(180.0)	(189.6)
Other expense, net	(2.0)	0.0	(0.6)	(0.7)
(Loss) income from continuing operations before income taxes	53.2	48.1	80.6	52.0
Total assets:
Consolidated total assets	36,696.8		36,696.8		$ 35,792.8
Total cash provided from operating activities:
Consolidated cash provided from operating activities			109.2	(16.5)
Income tax expense (benefit)	50.2	(15.4)	75.6	(21.0)
Net income	(51.4)	15.9	209.4	22.9
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	3.0	63.5	5.0	73.0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(54.4)	(47.6)	204.4	(50.1)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent				(50.1)
Net Income (Loss) Attributable to Parent	(82.1)	(24.7)	130.1	(58.6)
Less: Net income attributable to noncontrolling interest	30.7	40.6	79.3	81.5
Total segments [Member]
Revenues:
Consolidated revenues	1,215.4	1,265.7	2,404.7	2,469.1
Operating income (loss):
Consolidated operating income	153.6	159.9	291.5	283.4
Intersegment Eliminations [Member]
Revenues:
Consolidated revenues	4.5	16.0	10.7	10.6
Operating income (loss):
Consolidated operating income	13.5	12.8	15.8	(6.2)
Interest expense				(2.3)
Other expense, net			(0.4)	(0.3)
(Loss) income from continuing operations before income taxes			(212.3)	(45.9)
Total cash provided from operating activities:
Income tax expense (benefit)			8.5	(10.7)
Net income			(220.8)	(35.2)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0
Net Income (Loss) Attributable to Parent			(220.8)	(35.2)
Insurance Segment [Member]
Revenues:
Consolidated revenues	41.0	40.1	12.3	30.1
Operating income (loss):
Consolidated operating income	(4.1)	(1.4)	(19.5)	(1.4)
Other expense, net			0.1
(Loss) income from continuing operations before income taxes			(19.4)	(1.4)
Total assets:
Consolidated total assets	1,776.9		1,776.9		1,824.9
Total cash provided from operating activities:
Income tax expense (benefit)			8.7	(1.8)
Net income			(28.1)	0.4
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0
Net Income (Loss) Attributable to Parent			(28.1)	0.4
Consumer Products Segment [Member]
Revenues:
Consolidated revenues	1,169.9	1,209.6	2,381.7	2,428.4
Operating income (loss):
Consolidated operating income	144.2	148.5	295.2	291.0
Interest expense			(106.4)	(115.9)
Other expense, net			(0.8)	(4.3)
(Loss) income from continuing operations before income taxes			188.0	170.8
Total assets:
Consolidated total assets	7,129.4		7,129.4		7,069.1
Total cash provided from operating activities:
Income tax expense (benefit)			64.1	4.4
Net income			123.9	166.4
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0
Net Income (Loss) Attributable to Parent			72.0	96.1
Less: Net income attributable to noncontrolling interest			51.9	70.3
Corporate expenses [Member]
Revenues:
Consolidated revenues	0.7	1.6	1.0	7.6
Operating income (loss):
Consolidated operating income	(10.1)	$ (17.4)	(30.3)	(41.1)
Interest expense			(73.6)	(71.4)
Other expense, net			0.5	3.9
(Loss) income from continuing operations before income taxes			124.3	(71.5)
Total assets:
Consolidated total assets	$ 2,615.0		2,615.0		$ 2,632.0
Total cash provided from operating activities:
Income tax expense (benefit)			(5.7)	(12.9)
Net income			130.0	(58.6)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0
Net Income (Loss) Attributable to Parent			130.1	$ (58.6)
Less: Net income attributable to noncontrolling interest			$ (0.1)