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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 9 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Net earnings from continuing operations $ 9.2 $ (62.3) $ 23.8 $ 17.7 $ 92.0
Mandatory preferred stock dividends (4.4)   0.0 (7.7) 0.0
Net earnings from continuing operations attributable to common shareholders 4.8   23.8 10.0 92.0
Loss from discontinued operations, net of tax (1.8) $ (11.0) 0.0 (12.8) 0.0
Net earnings/(loss) attributable to common shareholders $ 3.0   $ 23.8 $ (2.8) $ 92.0
Basic average shares outstanding (shares) 69.6   59.7 65.5 59.9
Basic net (loss)/earnings per common share- continuing operations (in dollars per share) $ 0.07   $ 0.40 $ 0.15 $ 1.54
Basic net loss per common share- discontinued operations (in dollars per share) (0.03)   0 (0.19) 0
Basic net (loss)/earnings per common share (in dollars per share) $ 0.04   $ 0.40 $ (0.04) $ 1.54
Weighted average shares of common stock - Diluted (shares) 70.6   61.4 66.5 61.4
Diluted net (loss)/earnings per common share- continuing operations (in dollars per share) $ 0.07   $ 0.39 $ 0.15 $ 1.50
Diluted net loss per common share- discontinued operations (in dollars per share) (0.03)   0 (0.19) 0
Diluted net (loss)/earnings per common share (in dollars per share) $ 0.04   $ 0.39 $ (0.04) $ 1.50
Amount reclassified from liability based plan to equity compensation plan $ 0.1        
Performance Shares          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       0.8 0.5
Deferred Compensation, Share-based Payments          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Effect of dilutive performance shares (shares) 0.2   0.2 0.2 0.2
Performance Shares          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Effect of dilutive performance shares (shares) 0.5   1.0 0.5 0.9
Restricted Stock Equivalents          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Effect of dilutive performance shares (shares) 0.3   0.5 0.3 0.4