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Asset Acquisition, Legal And Diligence Fees

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Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of expense for integration-related cost incurred in connection with business combination. Includes system integration and conversion costs; severance and other employee-related costs; restructuring and other post-combination costs. Excludes acquisition-related cost incurred to effect business combination; cost to issue debt or equity securities; and cost related to acquisition of asset.

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Amount of asset acquired in excess of (less than) liability assumed plus goodwill in business combination and recognized at acquisition date.

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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 cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Acquisitions - Narrative (Details) € in Millions, $ in Millions						3 Months Ended				9 Months Ended
	May 02, 2025 EUR (€)	Sep. 24, 2024 EUR (€)	May 08, 2024 USD ($)	Oct. 27, 2023 USD ($)	Oct. 27, 2023 EUR (€)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Asset Acquisition [Line Items]
Payment for contingent consideration liability							$ (0.5)					$ 0.0
Goodwill						$ 1,050.1				$ 1,050.1			$ 1,046.0
Acquisition and integration costs									$ 1.6			4.9
Cost of Sales
Asset Acquisition [Line Items]
Acquisition and integration costs									0.2			3.1
Batteries & Lights
Asset Acquisition [Line Items]
Goodwill						901.8				901.8			$ 897.9
APS Battery Manufacturing Assets
Asset Acquisition [Line Items]
Asset acquisition, consideration transferred				$ 11.6	€ 3.5
APS Battery Manufacturing Assets \| Other Nonoperating Income (Expense)
Asset Acquisition [Line Items]
Asset acquisition, income from producing inventory												1.0
APS Battery Manufacturing Assets \| Selling, general and administrate expense
Asset Acquisition [Line Items]
Legal and diligence fees									$ 1.4			$ 2.8
APS Battery Manufacturing Assets \| Batteries & Lights
Asset Acquisition [Line Items]
Goodwill acquired										0.7
APS NV Acquisition
Asset Acquisition [Line Items]
Business combination, consideration transferred \| €		€ 26.8
Payments to acquire businesses, gross \| €	€ 13.3
Centralsul Ltda.
Asset Acquisition [Line Items]
Business combination, consideration transferred			$ 15.0
Payments to acquire businesses, gross			10.6					$ 0.1
Net assets acquired			16.5
Goodwill			14.6
Goodwill acquired \| €											€ 0.1
Acquisition and integration costs						0.3				1.1
Centralsul Ltda. \| Batteries & Lights
Asset Acquisition [Line Items]
Goodwill acquired										0.0
Centralsul Ltda. \| Indemnity Holdback
Asset Acquisition [Line Items]
Contingent consideration liability			2.0
Centralsul Ltda. \| Earnout, Financial Metrics
Asset Acquisition [Line Items]
Contingent consideration liability			$ 5.0
Centralsul, LTDA, APS Battery Manufacturing Assets, And APS NV Acquisitions
Asset Acquisition [Line Items]
Acquisition and integration costs						$ 1.3				$ 4.8