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Earnings per share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2023
Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Net earnings $ 31.8 $ 40.0 $ 49.0   $ 52.4 $ 19.0 $ 60.0    
Mandatory preferred stock dividends 0.0       0.0     $ 0.0 $ (4.0)
Net earnings attributable to common shareholders $ 31.8       $ 52.4     $ 120.8 $ 127.4
Weighted Average Number of Shares Outstanding, Basic 71,500       71,300     71,400 69,500
Basic net (loss)/earnings per common share- continuing operations (in dollars per share) $ 0.44       $ 0.73     $ 1.69 $ 1.83
Weighted Average Number of Shares Outstanding, Diluted 72,500       71,700     72,400 69,900
Diluted net (loss)/earnings per common share- continuing operations (in dollars per share) $ 0.44       $ 0.73     $ 1.67 $ 1.82
Net earnings $ 31.8       $ 52.4     $ 120.8 $ 131.4
Basic net (loss)/earnings per common share (in dollars per share) $ 0.44       $ 0.73     $ 1.69 $ 1.83
Performance Shares                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,300       1,600     1,300 1,600
Restricted Stock Equivalents                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         400     100 400
Deferred Compensation, Share-based Payments                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Effect of dilutive performance shares (shares) 0       100     100 100
Common Stock                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Stock Issued During Period, Shares, Conversion of Convertible Securities       4,700   4,687      
Retained (Losses)/Earnings                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Net earnings $ 31.8 $ 40.0 $ 49.0   $ 52.4 $ 19.0 60.0    
Mandatory preferred stock dividends             $ (4.0)    
Net earnings $ 31.8                
Performance Shares                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Effect of dilutive performance shares (shares) 500       100     500 200
Restricted Stock Equivalents                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Effect of dilutive performance shares (shares) 500       200     400 100