Segment and Georgraphic Data - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations			$ (234.6)	$ (151.7)
Revenues:
Consolidated segment revenues	$ 766.1	$ 757.4	1,412.6	1,359.7
Depreciation of properties and amortization of intangibles			67.2	61.7
Operating income:
Consolidated operating income	28.9	95.3	55.5	136.6
Interest expense	(67.6)	(77.7)	(143.1)	(156.4)
Other income (expense), net	0.2	(1.4)	1.2	(0.4)
(Loss) income from continuing operations before income taxes	(38.5)	16.2	(86.4)	(20.2)
Total assets:
Assets	8,240.3		8,240.3		$ 35,849.7
Net change in cash due to operating activities
Net sales to external customers	766.1	756.4	1,412.6	1,358.7
Income tax (benefit) expense	(1.2)	24.0	(127.2)	29.6
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(37.3)	(7.8)	40.8	(49.8)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0.7	(43.6)	501.5	259.2
Net income	(36.6)	(51.4)	542.3	209.4
Less: Net income attributable to noncontrolling interest	0.5	30.7	72.0	79.3
Net Income (Loss) Attributable to Parent	(37.1)	(82.1)	470.3	130.1
Consumer Products Segment [Member]
Revenues:
Consolidated segment revenues	766.1	756.4	1,412.6	1,358.7
Operating income:
Consolidated operating income	43.1	104.8	77.1	166.3
Interest expense			(80.6)	(81.9)
Other income (expense), net			(2.7)	(0.9)
(Loss) income from continuing operations before income taxes			(6.2)	83.5
Total assets:
Assets	7,576.8		7,576.8		7,419.7
Net change in cash due to operating activities
Net sales to external customers			1,412.6	1,358.7
Income tax (benefit) expense			(127.2)	31.1
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			121.0	52.4
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			41.6	71.5
Net income			162.6	123.9
Less: Net income attributable to noncontrolling interest			66.6	51.9
Net Income (Loss) Attributable to Parent			96.0	72.0
Corporate expenses
Revenues:
Consolidated segment revenues		1.0		1.0
Operating income:
Consolidated operating income	(14.2)	$ (9.5)
Corporate and Other and eliminations [Member]
Revenues:
Consolidated segment revenues				1.0
Operating income:
Consolidated operating income			(21.6)	(29.7)
Interest expense			(62.5)	(74.5)
Other income (expense), net			3.9	0.5
(Loss) income from continuing operations before income taxes			(80.2)	(103.7)
Total assets:
Assets	$ 663.5		663.5		$ 103.8
Net change in cash due to operating activities
Net sales to external customers			0.0	0.0
Income tax (benefit) expense			0.0	(1.5)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0
Net income			(80.2)	(102.2)
Less: Net income attributable to noncontrolling interest			0.0	(0.1)
Net Income (Loss) Attributable to Parent			$ (80.2)	$ (102.1)