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Share-Based Compensation (Tables)
9 Months Ended
Jun. 30, 2022
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 EndedNine Months Ended
30 June30 June
2022202120222021
Before-tax share-based compensation cost$10.7 $12.2 $38.0 $34.6 
Income tax benefit(2.6)(3.2)(9.3)(8.6)
After-tax share-based compensation cost$8.1 $9.0 $28.7 $26.0 
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 volatility30.5 %
Risk-free interest rate0.8 %
Expected dividend yield2.1 %