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Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Share-Based Compensation (Textual) [Abstract]
Pre-tax share-based compensation expense	$ 21.0	$ 27.0	$ 44.0	$ 51.0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			190	217
Weighted average share fair value (usd per share)			$ 93	$ 86
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			58	79
Weighted average share fair value (usd per share)			$ 388	$ 295
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			89	238
Weighted average share fair value (usd per share)			$ 296	$ 276
Unrestricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			6	6
Weighted average share fair value (usd per share)			$ 297	$ 278