Guarantor Statements - SB/RH (Statement Of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Condensed Statement of Income Captions [Line Items]
Net income	$ 473.2	$ 872.0	$ 273.2
Net unrealized loss on foreign currency translation	(65.3)	(44.3)	29.1
Unrealized gain (loss) on derivative instruments	26.4	16.2	(29.1)
Defined benefit pension gain (loss)	(21.3)	3.8	20.5
Deconsolidation of discontinued operations	21.9	(445.9)
Net change to derive comprehensive (loss) income for the periods	(38.3)	(458.1)	120.1
Comprehensive income (loss)	434.9	413.9	393.3
Comprehensive loss attributable to non-controlling interest	(0.5)	(2.8)	195.2
Comprehensive income (loss) attributable to controlling interest	435.4	416.7	198.1
Parent [Member]
Condensed Statement of Income Captions [Line Items]
Net income	507.5	180.8	307.5
Net unrealized loss on foreign currency translation	(65.3)	(44.3)	29.1
Unrealized gain (loss) on derivative instruments	26.4	16.2	(29.1)
Defined benefit pension gain (loss)	(21.3)	1.7	19.6
Deconsolidation of discontinued operations	21.8
Net change to derive comprehensive (loss) income for the periods	(38.4)	(26.4)	19.6
Comprehensive income (loss)	469.1	154.4	327.1
Comprehensive income (loss) attributable to controlling interest	469.1	154.4	327.1
SB/RH [Member]
Condensed Statement of Income Captions [Line Items]
Net income	520.0	182.9	301.2
Net unrealized loss on foreign currency translation	(65.3)	(44.3)	29.1
Unrealized gain (loss) on derivative instruments	26.4	16.2	(29.1)
Defined benefit pension gain (loss)	(21.3)	1.7	19.6
Deconsolidation of discontinued operations	21.9
Net change to derive comprehensive (loss) income for the periods	(38.3)	(26.4)	19.6
Comprehensive income (loss)	481.7	156.5	320.8
Comprehensive loss attributable to non-controlling interest	(0.5)	(0.3)	(0.2)
Comprehensive income (loss) attributable to controlling interest	482.2	156.8	321.0
Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net income	(911.9)	(490.0)	(566.6)
Net unrealized loss on foreign currency translation	137.2	89.8	(66.3)
Unrealized gain (loss) on derivative instruments	(5.0)	(26.6)	30.2
Defined benefit pension gain (loss)	19.4	5.2	(29.3)
Deconsolidation of discontinued operations	(43.5)
Net change to derive comprehensive (loss) income for the periods	108.1	68.4	(65.4)
Comprehensive income (loss)	(803.8)	(421.6)	(632.0)
Comprehensive income (loss) attributable to controlling interest	(803.8)	(421.6)	(632.0)
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income	364.6	334.9	364.5
Net unrealized loss on foreign currency translation	(66.0)	(43.6)	32.0
Unrealized gain (loss) on derivative instruments	2.5	13.3	(15.1)
Defined benefit pension gain (loss)	(9.7)	(2.6)	14.6
Deconsolidation of discontinued operations	21.8
Net change to derive comprehensive (loss) income for the periods	(51.4)	(32.9)	31.5
Comprehensive income (loss)	313.2	302.0	396.0
Comprehensive income (loss) attributable to controlling interest	313.2	302.0	396.0
Nonguarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income	559.8	157.2	195.8
Net unrealized loss on foreign currency translation	(71.2)	(46.2)	34.3
Unrealized gain (loss) on derivative instruments	2.5	13.3	(15.1)
Defined benefit pension gain (loss)	(9.7)	(2.6)	14.7
Deconsolidation of discontinued operations	21.8
Net change to derive comprehensive (loss) income for the periods	(56.6)	(35.5)	33.9
Comprehensive income (loss)	503.2	121.7	229.7
Comprehensive loss attributable to non-controlling interest	(0.5)	(0.3)	(0.2)
Comprehensive income (loss) attributable to controlling interest	$ 503.7	$ 122.0	$ 229.9