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Earnings per share
 3 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Earnings per share Earnings per share
Basic earnings per share is based on the average number of common shares 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 restricted stock unit (RSU) awards, performance share awards and deferred compensation equity plans.

The following table sets forth the computation of basic and diluted earnings per share for the quarters ended December 31, 2024 and 2023:
(in millions, except per share data)For the Quarters Ended December 31,
Basic net earnings per share20242023
Net earnings$22.3 $1.9 
Weighted average common shares outstanding - Basic72.0 71.7 
Basic net earnings per common share$0.31 $0.03 
Diluted net earnings per share
Weighted average common shares outstanding - Basic72.0 71.7 
Dilutive effect of RSU awards0.5 0.4 
Dilutive effect of performance shares0.7 0.5 
Weighted average common shares outstanding - Diluted73.2 72.6 
Diluted net earnings per common share$0.30 $0.03 

For the quarter ended December 31, 2024 there were no antidilutive RSU shares and for the quarter ended December 31, 2023 there were 0.5 million antidilutive RSU shares not included in the diluted net earnings per share calculation.
Performance based RSU shares of 0.9 million and 1.3 million were excluded for the quarters ended December 31, 2024 and 2023, respectively as the performance targets for those awards have not been achieved as of the end of the applicable periods.