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Goodwill and intangible assets - Schedule of Goodwill (Details) - 3 months ended Dec. 31, 2024 € in Millions, $ in Millions	USD ($)	EUR (€)
Goodwill [Roll Forward]
Beginning balance	$ 1,046.0
Cumulative translation adjustment	(14.5)
Ending balance	1,031.6
Centralsul Ltda.
Goodwill [Roll Forward]
Goodwill acquired | €		€ 0.1
Batteries & Lights
Goodwill [Roll Forward]
Beginning balance	897.9
Cumulative translation adjustment	(12.9)
Ending balance	885.0
Batteries & Lights | Centralsul Ltda.
Goodwill [Roll Forward]
Goodwill acquired	0.0
Auto Care
Goodwill [Roll Forward]
Beginning balance	148.1
Cumulative translation adjustment	(1.6)
Ending balance	146.6
Auto Care | Centralsul Ltda.
Goodwill [Roll Forward]
Goodwill acquired	$ 14.6	€ 0.1

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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