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Share-Based Compensation (Tables)
3 Months Ended
Dec. 31, 2024
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
31 December
20242023
Before-tax share-based compensation cost$16.5 $13.6 
Income tax benefit(4.0)(3.3)
After-tax share-based compensation cost$12.5 $10.3 
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 volatility30.4 %
Risk-free interest rate4.1 %
Expected dividend yield2.1 %