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Equity Items - Schedule of Stock Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Share Repurchase Program [Line Items]
Number of shares repurchased		0	1,541,320	0	1,541,320
Weighted-average price per share	[1]	$ 0		$ 0
Aggregate purchase price	[1]	$ 0		$ 0
2023 Stock Repurchase Program
Share Repurchase Program [Line Items]
Number of shares repurchased			1,500,000		1,500,000
Weighted-average price per share	[1]		$ 64.9		$ 64.9
Aggregate purchase price	[1]		$ 100		$ 100
[1] Includes transaction costs.

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- Definition

Share repurchase program, aggregate purchase price.

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- Definition

Share repurchase program, weighted-average price per share.

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- Definition

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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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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