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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to nonvested stock and stock unit awards	$ 176.2
Remaining weighted-average vesting period	1 year 7 months 6 days
Weighted-average grant-date fair values of stock awards and stock unit awards granted	$ 20.97	$ 25.60	$ 22.74
Fair value of stock awards and stock unit awards vested	$ 234.3	$ 180.4	$ 210.4
Total shares issued under ESIP	1.4
Shares reserved for future issuance under ESIP	0.3
Universal Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance under the stock plan	165.0
Number of shares available for grant under stock plan	17.6
Number of Additional Shares Authorized	25.0
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance under the stock plan	23.0
Number of shares available for grant under stock plan	16.9

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