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Divestitures (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 29, 2019 | Jan. 28, 2019 | Jan. 02, 2019 | Nov. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Income tax (benefit) expense |  |  |  |  | $ (7.1) | $ (462.7) | $ (11.8) |
FGL Merger [Member] |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 445.9 |  |
Income tax (benefit) expense |  |  |  |  |  | 5.9 |  |
Global Battery And Lighting [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain on sale |  |  | $ 989.8 |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 0.0 | 8.3 | 30.9 |
Write-down of assets of business held for sale to fair value less cost to sell |  |  |  |  | 0.0 |  |  |
Transaction costs associated with the divestiture |  |  |  |  | 12.9 | 60.7 |  |
Indenmifications, acquisition agreement |  |  |  |  | 48.0 |  |  |
Global Battery And Lighting [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net settlement payable |  |  |  |  | 34.3 |  |  |
Global Battery And Lighting [Member] | Other Long-term Liabilities [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net settlement payable |  |  |  |  | 13.7 |  |  |
Global Auto Care [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 1.4 | 16.3 | 21.1 |
Write-down of assets of business held for sale to fair value less cost to sell |  |  |  |  | 111.0 |  |  |
Transaction costs associated with the divestiture |  |  |  |  | 8.8 | $ 0.0 |  |
Net settlement receivable |  |  |  |  | 3.9 |  |  |
Global Auto Care [Member] | Other Long-term Liabilities [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Indenmifications, acquisition agreement |  |  |  |  | 1.4 |  |  |
Fidelity And Guaranty Life [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Estimate fair value less cost to sell held for sale assets |  |  |  |  |  |  | 402.2 |
Fidelity And Guaranty Life [Member] | FGL Merger [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Share price |  |  |  | $ 31.10 |  |  |  |
Transaction costs associated with the divestiture |  |  |  | $ 1,488.3 |  |  |  |
Front Street RE Cayman Ltd [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Estimate fair value less cost to sell held for sale assets |  |  |  |  |  |  | $ 19.0 |
Energizer [Member] | Global Battery And Lighting [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  | 1,956.2 |  |  |  |  |
Purchase price adjustment |  |  | $ 200.0 |  |  |  |  |
Energizer [Member] | Global Battery And Lighting [Member] | Maximum [Member] |  |  |  |  |  |  |  |
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 [Member] | Global Battery And Lighting [Member] | Downward Adjustment Equal To 75% [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Purchase price adjustment |  |  | $ 600.0 |  |  |  |  |
Energizer [Member] | Global Battery And Lighting [Member] | Upward Adjustment Equal To 25% [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Purchase price adjustment |  |  | $ 200.0 |  |  |  |  |
Energizer [Member] | Varta [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Transaction costs associated with the divestiture | $ 200.0 |  |  |  |  |  |  |
Energizer [Member] | Global Auto Care [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Purchase price, cash |  | $ 938.7 |  |  |  |  |  |
Stock consideration, value |  | 242.1 |  |  |  |  |  |
Write-down of assets of business held for sale to fair value less cost to sell |  |  |  |  | $ 111.0 |  |  |
Energizer [Member] | Global Auto Care [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Stock consideration, value |  | $ 242.1 |  |  |  |  |  |
CF Entities [Member] | FS Holdco [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Payment for exercised the 338 Tax Election |  |  |  |  |  |  |  | $ 26.6
CF Entities [Member] | Front Street RE Cayman Ltd [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Transaction costs associated with the divestiture |  |  |  | 65.0 |  |  |  |
Amount of purchase price deposited in escrow |  |  |  | $ 6.5 |  |  |  |

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