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Earnings Per Share (Notes)
 12 Months Ended
Sep. 30, 2025
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 the year. 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 sets forth the computation of basic and diluted earnings per share.
 Year Ended September 30,
202520242023
Net earnings
$216.2 $246.5 $165.5 
shares in millions
Weighted-average shares for basic earnings per share126.9 130.3 133.0 
Effect of dilutive securities:
    Stock options0.2 0.2 0.1 
    Restricted stock units0.3 0.3 0.3 
    Performance-based restricted stock units1.1 1.5 0.7 
Weighted-average shares for diluted earnings per share128.5 132.3 134.1 
Basic earnings per share
$1.70 $1.89 $1.24 
Diluted earnings per share
$1.68 $1.86 $1.23 
The following table details the securities that have been excluded from the calculation of weighted-average shares for diluted earnings per share as they were anti-dilutive.
 Year Ended September 30,
shares in millions202520242023
Restricted stock units0.1 — 0.1 
Performance-based restricted stock units— — 0.1