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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				1 Months Ended	3 Months Ended		4 Months Ended	5 Months Ended	12 Months Ended
	May 23, 2024	Nov. 16, 2023	Jun. 20, 2023	May 31, 2024	Sep. 30, 2025	Feb. 28, 2025	Jun. 29, 2025	May 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)									4.4	7.4	5.7
Average price per share (in dollars per share)									$ 74.52	$ 76.66	$ 75.36
Amount	$ 50.0			$ 50.0
Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount									$ 326.4	$ 565.9	$ 434.7
Open market purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)					0.8	1.8	0.8	1.9	4.4	5.6	0.4
Average price per share (in dollars per share)									$ 74.52	$ 77.48	$ 81.60
Amount					$ 45.3			$ 153.6
Open market purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount									$ 326.4	$ 432.7	$ 34.7
Private purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)									0.0	0.5	0.0
Average price per share (in dollars per share)									$ 0	$ 93.74	$ 0
Private purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount									$ 0.0	$ 50.0	$ 0.0
ASR Agreement
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)		1.3	5.3						0.0	1.3	5.3
Average price per share (in dollars per share)									$ 0	$ 65.84	$ 74.86
Amount										$ 0.0	$ 500.0
ASR Agreement | Treasury Stock
Accelerated Share Repurchases [Line Items]
Amount			$ 400.0						$ 0.0	$ 83.2	$ 400.0

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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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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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