Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Net income (loss)	$ 729.6	$ (23.4)	$ 617.4	$ 555.5
Other comprehensive income (loss)
Foreign currency translation (loss) gain	0.3	27.6	(18.3)	18.3
Deferred tax effect	(2.6)	(3.3)	(4.9)	3.9
Deferred tax valuation allowance		(0.1)	0.1
Net unrealized (loss) gain on foreign currency translation	(2.3)	24.2	(23.1)	22.2
Unrealized gain (loss) on derivative instruments
Unrealized gain (loss) on hedging activity before reclassification	9.1	(18.5)	23.5	(19.3)
Net reclassification for (gain) loss to income from continuing operations	(2.9)	4.3	(5.7)	3.9
Net reclassification for loss (gain) to income from discontinued operations	0.6	(1.1)	0.5	1.8
Unrealized gain (loss) on hedging instruments after reclassification	6.8	(15.3)	18.3	(13.6)
Deferred tax effect	(1.9)	3.7	(5.0)	3.8
Net unrealized gain (loss) on hedging derivative instruments	4.9	(11.6)	13.3	(9.8)
Defined benefit pension (loss) gain
Defined benefit pension (loss) gain before reclassification	(0.3)	(1.5)	0.8	(2.2)
Net reclassification for loss to income from continuing operations	0.5	0.7	1.0	1.2
Net reclassification for loss to income from discontinued operations		0.1	0.2	0.4
Defined benefit pension gain (loss) after reclassification	0.2	(0.7)	2.0	(0.6)
Deferred tax effect	(0.2)	0.2	(0.5)	0.2
Net defined benefit pension (loss) gain		(0.5)	1.5	(0.4)
Unrealized investment gain
Unrealized investment gain before reclassification				26.0
Net reclassification for (gain) loss to income from discontinued operations				(6.3)
Unrealized gain on investments after reclassification				19.7
Adjustments to intangible assets				(0.9)
Deferred tax effect				(6.7)
Net unrealized gain on investments				12.1
Deconsolidation of discontinued operations	21.9		21.9	(445.9)
Net change to derive comprehensive income for the periods	24.5	12.1	13.6	(421.8)
Comprehensive income (loss)	754.1	(11.3)	631.0	133.7
Comprehensive income (loss) attributable to non-controlling interest		5.6		79.6
Comprehensive income (loss) attributable to controlling interest	754.1	(16.9)	631.0	54.1
SB/RH [Member]
Net income (loss)	771.2		669.1
Other comprehensive income (loss)
Foreign currency translation (loss) gain	0.3		(18.3)
Deferred tax effect	(2.6)		(4.9)
Deferred tax valuation allowance			0.1
Net unrealized (loss) gain on foreign currency translation	(2.3)		(23.1)
Unrealized gain (loss) on derivative instruments
Unrealized gain (loss) on hedging activity before reclassification	9.1		23.5
Net reclassification for (gain) loss to income from continuing operations	(2.9)		(5.7)
Net reclassification for loss (gain) to income from discontinued operations	0.6		0.5
Unrealized gain (loss) on hedging instruments after reclassification	6.8		18.3
Deferred tax effect	(1.9)		(5.0)
Net unrealized gain (loss) on hedging derivative instruments	4.9		13.3
Defined benefit pension (loss) gain
Defined benefit pension (loss) gain before reclassification	(0.3)		0.8
Net reclassification for loss to income from continuing operations	0.5		1.0
Net reclassification for loss to income from discontinued operations			0.2
Defined benefit pension gain (loss) after reclassification	0.2		2.0
Deferred tax effect	(0.2)		(0.5)
Net defined benefit pension (loss) gain			1.5
Unrealized investment gain
Deconsolidation of discontinued operations	21.9		21.9
Net change to derive comprehensive income for the periods	24.5		13.6
Comprehensive income (loss)	795.7		682.7
Comprehensive income (loss) attributable to controlling interest	$ 795.7		$ 682.7
Three Month Periods Ended April 1, 2018 [Member] | SB/RH [Member]
Net income (loss)		26.2
Other comprehensive income (loss)
Foreign currency translation (loss) gain		27.6
Deferred tax effect		(3.3)
Deferred tax valuation allowance		(0.1)
Net unrealized (loss) gain on foreign currency translation		24.2
Unrealized gain (loss) on derivative instruments
Unrealized gain (loss) on hedging activity before reclassification		(18.5)
Net reclassification for (gain) loss to income from continuing operations		4.3
Net reclassification for loss (gain) to income from discontinued operations		(1.1)
Unrealized gain (loss) on hedging instruments after reclassification		(15.3)
Deferred tax effect		3.7
Net unrealized gain (loss) on hedging derivative instruments		(11.6)
Defined benefit pension (loss) gain
Defined benefit pension (loss) gain before reclassification		(1.5)
Net reclassification for loss to income from continuing operations		0.7
Net reclassification for loss to income from discontinued operations		0.1
Defined benefit pension gain (loss) after reclassification		(0.7)
Deferred tax effect		0.2
Net defined benefit pension (loss) gain		(0.5)
Unrealized investment gain
Net change to derive comprehensive income for the periods		12.1
Comprehensive income (loss)		38.3
Comprehensive income (loss) attributable to non-controlling interest		0.3
Comprehensive income (loss) attributable to controlling interest		$ 38.0
Six Month Periods Ended April 1, 2018 [Member] | SB/RH [Member]
Net income (loss)				195.6
Other comprehensive income (loss)
Foreign currency translation (loss) gain				18.3
Deferred tax effect				3.9
Net unrealized (loss) gain on foreign currency translation				22.2
Unrealized gain (loss) on derivative instruments
Unrealized gain (loss) on hedging activity before reclassification				(19.3)
Net reclassification for (gain) loss to income from continuing operations				3.9
Net reclassification for loss (gain) to income from discontinued operations				1.8
Unrealized gain (loss) on hedging instruments after reclassification				(13.6)
Deferred tax effect				3.8
Net unrealized gain (loss) on hedging derivative instruments				(9.8)
Defined benefit pension (loss) gain
Defined benefit pension (loss) gain before reclassification				(2.2)
Net reclassification for loss to income from continuing operations				1.2
Net reclassification for loss to income from discontinued operations				0.4
Defined benefit pension gain (loss) after reclassification				(0.6)
Deferred tax effect				0.2
Net defined benefit pension (loss) gain				(0.4)
Unrealized investment gain
Net change to derive comprehensive income for the periods				12.0
Comprehensive income (loss)				207.6
Comprehensive income (loss) attributable to non-controlling interest				0.5
Comprehensive income (loss) attributable to controlling interest				$ 207.1