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Earnings Per Share (Tables)
 6 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
Three Months Ended
March 31,		Six Months Ended
March 31,
2024202320242023
Net earnings$57.2 $30.9 $101.1 $75.1 
Weighted-average shares for basic earnings per share131.0 133.4 131.1 134.1 
Effect of dilutive securities:
    Stock options0.2 0.1 0.2 0.1 
    Restricted stock units0.3 0.2 0.3 0.2 
    Performance-based restricted stock units1.5 0.8 1.4 0.4 
Weighted-average shares for diluted earnings per share133.0 134.5 133.0 134.8 
Basic earnings per common share$0.44 $0.23 $0.77 $0.56 
Diluted earnings per common share$0.43 $0.23 $0.76 $0.56 
Antidilutive securities excluded from computation of earnings per share
Three Months Ended
March 31,		Six Months Ended
March 31,
2024202320242023
Restricted stock units— — — 0.1 
Performance-based restricted stock units— — — 0.3