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Divestitures - Summary of Components of Income from Discontinued Operations, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax									$ 14.0	$ 682.5	$ 445.0
Income from discontinued operations, net of tax attributable to controlling interest	$ 1.7	$ 8.0	$ 1.4	$ 2.8	$ (16.7)	$ (1.2)	$ 783.6	$ (83.2)	14.0	682.5	411.8
Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									4.1	859.2	466.3
Income tax (benefit) expense from discontinued operations									(9.9)	176.7	21.3
Income from discontinued operations, net of tax									14.0	682.5	445.0
Income from discontinued operations, net of tax attributable to noncontrolling interest									0.0	0.0	33.2
Income from discontinued operations, net of tax attributable to controlling interest									14.0	682.5	411.8
Discontinued Operations, Held-for-sale or Disposed of by Sale | Global Battery And Lighting
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									4.2	974.9	21.8
Discontinued Operations, Held-for-sale or Disposed of by Sale | Global Auto Care
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									(0.1)	(115.7)	(31.9)
Discontinued Operations, Held-for-sale or Disposed of by Sale | HRG Insurance Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes									$ 0.0	$ 0.0	$ 476.4

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