Related Party Transactions	12 Months Ended
Related Party Transactions	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions On January 28, 2019, the Company completed the Auto Care Acquisition from Spectrum, which included stock consideration of 5.3 million shares of Energizer common stock. In accordance with the terms of our Shareholder Agreement with Spectrum, Spectrum had the right to sell such shares on or after January 28, 2020, including through one or more registered secondary offerings. At September 30, 2020, Spectrum owned 1.7 million shares, or 2.5% of the Company's outstanding common shares. During the second quarter of fiscal 2021, Spectrum sold the remainder of their shares, and as such at September 30, 2021 they are no longer considered to be a related party. The transactions between Spectrum and Energizer prior to when Spectrum sold their remaining shares during fiscal 2021 are immaterial. The transactions discussed below cover the time period in which Spectrum was a related party of Energizer Holdings, Inc. in fiscal 2020 and 2019. Following the completion of the Battery and Auto Care Acquisitions, the Company and Spectrum entered into transition service agreements (TSA) and reverse TSA. Under the agreements, Energizer and Spectrum provided each other certain specified back office support services on a transitional basis, including among other things, payroll and other human resource services, information systems as well as accounting support. The charges for the transition services are generally intended to allow the providing company to fully recover the allocated direct costs of providing the services, plus all out-of-pocket costs and expenses, and including a nominal profit. As of September 30, 2020, the Company had exited the majority of the TSA and reverse TSA, and during the first quarter of fiscal 2021, the Company was out of all agreements. During the twelve months ended September 30, 2020 and 2019, the Company paid $2.3 and $0.2, respectively, to Spectrum related to rent for office space at their Middleton, Wisconsin headquarters. For the twelve months ended September 30, 2020, the Company incurred expense of $8.4 in SG&A and $0.4 in Cost of products sold. The Company also recorded income of $0.9 in Other items, net related to the reverse transaction services agreements provided for the twelve months end period. For the twelve months ended September 30, 2019, the Company incurred expense of $15.3 in SG&A and $1.0 in Cost of products sold. The Company recorded income of $1.4 in Other items, net related to the reverse transaction services agreements provided for the twelve months ended period. Related to these agreements, the Company had a payable to Spectrum of $1.6 in Other current liabilities and a receivable from Spectrum of $30.6 in Other current assets as of September 30, 2020, as well as a receivable from Spectrum in Other assets of $18.4 as of September 30, 2020. The asset balance from Spectrum also included the tax indemnification due from Spectrum under the initial purchase agreements. The Company also entered into a supply agreement with Spectrum, ancillary to the Auto Care Acquisition that became effective upon the consummation of the acquisition. The supply agreement resulted in expense to the Company of $17.8 and $9.8 for the twelve months ended September 30, 2020 and 2019, respectively. The Company recorded $2.7 in Accounts payable at September 30, 2020 related to these purchases. In discontinued operations, the Company recorded income of $3.8 and $11.8 for reverse TSA, and recorded expense of $0.3 and $1.3 for the twelve months ended September 30, 2020 and 2019, respectively.