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SHAREHOLDER’S EQUITY - Schedule of Activity of Common Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions					12 Months Ended
	May 23, 2024	May 20, 2024	Nov. 16, 2023	Jun. 20, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)					7.4	5.7	1.4
Average price per share (in dollars per share)					$ 76.66	$ 75.36	$ 97.34
Amount	$ 50.0	$ 50.0
Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount					$ 565.9	$ 434.7	$ 134.0
Open market purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)					5.6	0.4	1.4
Average price per share (in dollars per share)					$ 77.48	$ 81.60	$ 97.34
Open market purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount					$ 432.7	$ 34.7	$ 134.0
Private purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)					0.5	0.0	0.0
Average price per share (in dollars per share)					$ 93.74	$ 0	$ 0
Private purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount					$ 50.0	$ 0.0	$ 0.0
ASR
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			1.3	5.3	1.3	5.3	0.0
Average price per share (in dollars per share)					$ 65.84	$ 74.86	$ 0
Amount					$ 0.0	$ 500.0
ASR | Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount				$ 400.0	$ 83.2	$ 400.0	$ 0.0

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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