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Share-Based Compensation (Tables)
3 Months Ended
Dec. 31, 2025
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
20252024
Before-tax share-based compensation cost$10.3 $16.5 
Income tax benefit(2.4)(4.0)
After-tax share-based compensation cost$7.9 $12.5 
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 volatility34.5%
Risk-free interest rate3.6%
Expected dividend yield2.7%