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Earnings per Share - EPS Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net income $ 36.6 $ 16.3 $ 92.2 $ 57.9
Less: Net income allocated to participating securities (0.9) (0.3) (2.1) (1.0)
Net income allocated to common shareholders $ 35.7 $ 16.0 $ 90.1 $ 56.9
Weighted average number of common shares outstanding 18,807,104 18,781,401 18,809,823 18,731,203
Dilutive potential common shares outstanding:        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 296,062 230,125 312,858 272,517
Diluted weighted-average shares 19,103,166 19,011,526 19,122,681 19,003,720