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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, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net earnings $ 70.8 $ 60.4
Basic average shares outstanding (shares) 59.7 60.2
Effect of dilutive restricted stock equivalents (shares) 0.4 0.4
Effect of dilutive performance shares (shares) 0.2 0.0
Diluted average shares outstanding (shares) 61.0 61.5
Basic earnings per common share (dollars per share) $ 1.19 $ 1.00
Diluted earnings per common share (dollars per share) $ 1.16 $ 0.98
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]    
Effect of dilutive performance shares (shares) 0.7 0.9