Segments - Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	$ 31.5	$ 17.6	$ 62.4	$ 37.9
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	31.5	17.6	62.4	37.9
Other restructuring related costs \| Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	0.0	(0.3)	0.0	(0.3)
Cost of Sales \| Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	22.1	8.7	31.3	18.1
Cost of Sales \| Corporate \| US Operating Efficiency Project
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	5.0	0.0	11.1	0.0
Selling, general and administrate expense (SG&A) \| Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	4.4	3.8	20.0	8.6
Selling, general and administrate expense (SG&A) \| IT enablement \| Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total Restructuring and related costs	$ 0.0	$ 5.4	$ 0.0	$ 11.5

ENERGIZER HOLDINGS, INC. 10-Q