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Earnings Per Share (Notes)
 9 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Earnings per share EARNINGS PER SHARE
Basic earnings per share is based on the average number of shares of common stock outstanding during each period. Diluted earnings per share is based on the average number of shares of common stock used for the basic earnings per share calculation, adjusted for the dilutive effect of stock options and restricted stock units using the “treasury stock” method.
The following table presents the computation of basic and diluted earnings per share.
Three Months Ended
June 30,		Nine Months Ended
June 30,
2024202320242023
Net earnings$73.7 $44.3 $174.8 $119.4 
Weighted-average shares for basic earnings per share130.0 132.4 130.7 133.6 
Effect of dilutive securities:
    Stock options0.2 0.1 0.2 0.1 
    Restricted stock units0.3 0.3 0.3 0.2 
    Performance-based restricted stock units1.6 1.0 1.5 0.6 
Weighted-average shares for diluted earnings per share132.1 133.8 132.7 134.5 
Basic earnings per common share$0.57 $0.33 $1.34 $0.89 
Diluted earnings per common share$0.56 $0.33 $1.32 $0.89 
The following table presents the securities that have been excluded from the calculation of weighted-average shares for diluted earnings per share as they were anti-dilutive.
Three Months Ended
June 30,		Nine Months Ended
June 30,
2024202320242023
Performance-based restricted stock units— — — 0.2