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Earnings per share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net earnings $ 22.3 $ 1.9
Weighted average number of shares outstanding, basic (in shares) 72.0 71.7
Basic net (loss)/earnings per common share (in dollars per share) $ 0.31 $ 0.03
Weighted average number of shares outstanding, diluted (in shares) 73.2 72.6
Diluted net (loss)/earnings per common share- continuing operations (in dollars per share) $ 0.30 $ 0.03
Restricted Stock Equivalents    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   0.5
Performance Shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.9 1.3
Retained (Losses)/Earnings    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net earnings $ 22.3  
Performance Shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Effect of dilutive performance shares (shares) 0.7 0.5
Restricted Stock Equivalents    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Effect of dilutive performance shares (shares) 0.5 0.4