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Divestitures - Narrative (Details) $ / shares in Units, € in Millions					12 Months Ended
	Jan. 02, 2020 USD ($)	Jan. 28, 2019 USD ($)	Jan. 02, 2019 USD ($)	Nov. 30, 2017 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 29, 2020 USD ($)	Jan. 02, 2020 EUR (€)	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit					$ (70,900,000)	$ 7,100,000	$ 462,700,000
Loss on assets held for sale					26,800,000	0	0
FGL Merger
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reclassification of accumulated other comprehensive income to income from discontinued operations							445,900,000
Income tax benefit							5,900,000
Global Battery And Lighting
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale			$ 989,800,000
Transaction costs associated with the divestiture						12,900,000	60,700,000
Indemnifications, acquisition agreement					50,200,000
Global Battery And Lighting | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale						989,800,000
Depreciation and amortization expense					0
Global Battery And Lighting | Discontinued Operations, Held-For-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale							0
Depreciation and amortization expense							8,300,000
Global Battery And Lighting | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Tax benefit to discontinued operations					10,500,000
Global Battery And Lighting | Other Current Liabilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net settlement payable					33,000,000.0
Global Battery And Lighting | Other long term liabilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net settlement payable					17,200,000
Global Auto Care
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock consideration, value		$ 242,100,000
Global Auto Care | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs associated with the divestiture						8,800,000
Depreciation and amortization expense						1,400,000
Write-down of assets of business held for sale to fair value less cost to sell						(111,000,000.0)
Global Auto Care | Discontinued Operations, Held-For-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization expense							16,300,000
Write-down of assets of business held for sale to fair value less cost to sell							$ (92,500,000)
Global Auto Care | Other long term liabilities | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnifications, acquisition agreement					1,400,000
Fidelity And Guaranty Life | FGL Merger | Discontinued Operations, Held-For-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs associated with the divestiture				$ 1,488,300,000
Share price (in dollars per share) | $ / shares				$ 31.10
Coevorden Operations | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price, cash								$ 29,000,000.0
Goodwill								$ 10,600,000
Loss on assets held for sale					26,800,000
Energizer | Global Battery And Lighting
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price			1,956,200,000
Target sale price			600,000,000
Purchase price adjustment			$ 200,000,000
Contingent obligation					$ 197,000,000
Energizer | Global Battery And Lighting | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential downward adjustment, percentage			75.00%
Potential upward adjustment, percentage			25.00%
Energizer | Varta
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price | €									€ 180
Transaction costs associated with the divestiture	$ 200,000,000
Energizer | Global Auto Care | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price, cash		938,700,000
Write-down of assets of business held for sale to fair value less cost to sell						$ 111,000,000.0
Energizer | Global Auto Care | Common Stock | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock consideration, value		$ 242,100,000
CF Entities | FS Holdco | Discontinued Operations, Held-For-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payment for exercised the 338 Tax Election										$ 26,600,000
CF Entities | Front Street RE Cayman Ltd | Discontinued Operations, Held-For-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs associated with the divestiture				$ 65,000,000
Amount of purchase price deposited in escrow				$ 6,500,000
Escrow deposit period				15 months

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