Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Millions	6 Months Ended
Mar. 31, 2023 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2022	$ (145.3)
OCI before reclassifications	(25.0)
Reclassifications to earnings	(13.3)
Balance at December 31, 2022	(183.6)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2022	(77.7)
OCI before reclassifications	(17.2)
Reclassifications to earnings	0.0
Balance at December 31, 2022	(94.9)
Pension Activity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2022	(140.5)
OCI before reclassifications	2.1
Reclassifications to earnings	1.0
Balance at December 31, 2022	(137.4)
Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2022	11.7
OCI before reclassifications	(6.9)
Reclassifications to earnings	(5.6)
Balance at December 31, 2022	(0.8)
Zinc contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2022	(4.6)
OCI before reclassifications	2.1
Reclassifications to earnings	(0.2)
Balance at December 31, 2022	(2.7)
Interest Rate Contracts \| Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2022	65.8
OCI before reclassifications	(5.1)
Reclassifications to earnings	(8.5)
Balance at December 31, 2022	$ 52.2

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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