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Share-Based Compensation (Tables)
6 Months Ended
Mar. 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 EndedSix Months Ended
31 March31 March
2024202320242023
Before-tax share-based compensation cost$14.8 $15.5 $28.4 $32.4 
Income tax benefit(3.6)(3.9)(6.9)(7.9)
After-tax share-based compensation cost$11.2 $11.6 $21.5 $24.5 
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 volatility25.0 %
Risk-free interest rate4.3 %
Expected dividend yield2.6 %