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Share-Based Compensation (Tables)
3 Months Ended
Dec. 31, 2020
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
20202019
Before-tax share-based compensation cost$9.5 $15.4 
Income tax benefit(2.3)(3.7)
After-tax share-based compensation cost$7.2 $11.7 
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 volatility29.9 %
Risk-free interest rate0.2 %
Expected dividend yield2.1 %