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Restructuring Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		38 Months Ended
Restructuring Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 14.4	$ 8.0	$ 76.8	$ 45.9
US Manufacturing Efficiency Initiatives \| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Restructuring Cost and Reserve [Line Items]
Restructuring costs	3.8	0.0	14.9	0.0
Project Momentum Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost					$ 215.8
Restructuring costs	10.6	6.3	61.9	32.7
Batteries & Lights \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	12.8	7.1	73.7	41.5
Auto Care \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.6	$ 0.9	3.1	$ 4.4
Minimum \| Project Momentum Restructuring
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	65.0		65.0
Minimum \| Project Momentum Restructuring \| U.S. Manufacturing Initiatives
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	15.0		15.0
Maximum \| Project Momentum Restructuring
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	75.0		75.0
Maximum \| Project Momentum Restructuring \| U.S. Manufacturing Initiatives
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 20.0		$ 20.0