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Earnings (Loss) Per Share
 3 Months Ended
Dec. 31, 2025
Earnings Per Share [Abstract]  
(Loss) Earnings per Share EARNINGS PER SHARE
Basic earnings per share is based on the average number of shares of common stock outstanding during the period. Diluted earnings per share is based on the average number of shares 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 and convertible senior notes using the “if converted” method.
The following table sets forth the computation of basic and diluted earnings per share.
Three Months Ended
December 31,
20252024
Net earnings for basic earnings per share
$96.8 $113.3 
Impact of interest expense, net of tax, related to convertible senior notes2.7 2.7 
Net earnings for diluted earnings per share
$99.5 $116.0 
Weighted-average shares for basic earnings per share
51.7 58.3 
Effect of dilutive securities:
Stock options0.1 0.2 
Restricted stock units0.3 0.5 
Market-based performance restricted stock units0.6 0.7 
Earnings-based performance restricted stock units0.1 0.1 
Shares issuable upon conversion of convertible senior notes5.4 5.4 
Total dilutive securities6.5 6.9 
Weighted-average shares for diluted earnings per share
58.2 65.2 
Earnings per Common Share:
Basic$1.87 $1.94 
Diluted$1.71 $1.78 
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
December 31,
20252024
Restricted stock units0.1 — 
Market-based performance restricted stock units0.1 —