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Earnings Per Share (Tables)
 6 Months Ended
Mar. 31, 2023
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
Three Months Ended
March 31,		Six Months Ended
March 31,
2023202220232022
Net earnings available to common stockholders for basic earnings per share$30.9 $1.3 $75.1 $9.5 
Dilutive impact of net earnings attributable to NCI— — — — 
Net earnings available to common stockholders for diluted earnings per share$30.9 $1.3 $75.1 $9.5 
shares in millions
Weighted-average shares for basic earnings per share133.4 62.7 134.1 51.0 
Effect of dilutive securities:
    Stock options0.1 — 0.1 — 
    Restricted stock units0.2 0.2 0.2 0.2 
    Performance-based restricted stock units0.8 — 0.4 — 
Weighted-average shares for diluted earnings per share134.5 62.9 134.8 51.2 
Basic earnings per share of Common Stock$0.23 $0.02 $0.56 $0.19 
Diluted earnings per share of Common Stock$0.23 $0.02 $0.56 $0.19 
Antidilutive securities excluded from computation of earnings per share
Three Months Ended
March 31,		Six Months Ended
March 31,
shares in millions2023202220232022
Restricted stock units— 0.2 0.1 0.1 
Performance-based restricted stock units— 0.1 0.3 0.1