Share-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Schedule of Recognized Share-Based Compensation Cost

Share-based compensation cost recognized on the consolidated income statements is summarized below:

	Three Months Ended		Six Months Ended
	31 March		31 March
	2026	2025	2026	2025
Before-tax share-based compensation cost(A)	$16.0	$38.3	$26.3	$54.8
Income tax benefit	(3.8)	(9.0)	(6.2)	(13.0)
After-tax share-based compensation cost	$12.2	$29.3	$20.1	$41.8

(A)Fiscal year 2025 includes noncash executive separation costs of $22.4 to accelerate vesting of share-based awards. Refer to the "Shareholder Activism-Related Costs" disclosure in Note 17, Supplemental Information, for additional information.

Schedule of Assumptions for Fair Value of Market-Based Deferred Stock Units

The calculation of the fair value of market-based deferred stock units used the following assumptions:

Expected volatility	34.5	%
Risk-free interest rate	3.6	%
Expected dividend yield	2.7	%