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Related Parties - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 11, 2019 | Oct. 16, 2017 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 13, 2019
TSAs And Reverse TSAs |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Overall expected time period of transition |  |  |  | 12 months |  |
Related party income (loss) |  |  |  | $ (3.9) | $ 5.2 |
Transition Services Agreements |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party costs |  |  |  | 9.6 | 19.1 |
Reverse Transition Services Agreements |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party costs |  |  |  | $ 13.5 | 13.9 |
Maximum | TSAs And Reverse TSAs |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Overall expected time period of transition |  |  |  | 24 months |  |
Minimum | TSAs And Reverse TSAs |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Overall expected time period of transition |  |  |  | 12 months |  |
Energizer | TSAs And Reverse TSAs |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party, net receivable (payable) |  |  |  | $ 5.4 | 12.8 |
Energizer | H&G Supply Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party income (loss) |  |  |  | $ 18.9 | 12.5 |
Supply agreement contract term |  |  |  | 24 months |  |
Net receivable from related party |  |  |  | $ 4.4 | $ 4.9 |
Energizer | Energizer Shareholder Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Stock consideration (in shares) |  |  |  | 5,300,000 |  |
Standstill provision period |  |  |  | 24 months |  |
Board nomination voting period |  |  |  | 18 months |  |
Share repurchase period |  |  |  | 18 months |  |
Energizer | Energizer Shareholder Agreement | 12th Trading Day Preceding Notice Of Repurchase |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Consecutive trading days |  |  |  | 10 days |  |
Trading days |  |  |  | 12 days |  |
Energizer | Energizer Shareholder Agreement | Immediately Preceding Date Of Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Consecutive trading days |  |  |  | 10 days |  |
Percentage of volume-weighted average sales price per share |  |  |  | 100.00% |  |
Energizer | Minimum | Energizer Shareholder Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage beneficially owns of common stock |  |  |  | 4.90% |  |
Varta | TSAs And Reverse TSAs |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party, net receivable (payable) |  |  |  | $ (1.0) |  |
Jefferies |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Fees and reimbursements of expenses from related party |  | $ 3.0 |  |  |  |
Shares distributed (in shares) | 7,514,477 |  |  |  |  |
Conversion of share (in shares) | 0.025 |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  | $ 1.50
Percentage of dividend distribution per share |  |  |  |  |  | 7.40%
Jefferies | Minimum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage beneficially owns of common stock |  | 10.00% |  |  |  |
Chairman And Chief Executive Officer |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Shares of common stock repurchased from related parties (in shares) |  |  | 158,318 |  |  |
Value of repurchased common stock from related parties |  |  | $ 8.0 |  |  |
Average repurchase price per share (in dollars per share) |  |  | $ 50.53 |  |  |

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