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Earnings Per Share (Tables)
 9 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
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 
Antidilutive securities excluded from computation of earnings per share
Three Months Ended
June 30,		Nine Months Ended
June 30,
2024202320242023
Performance-based restricted stock units— — — 0.2