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Earnings per Share - EPS Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]        
Net income $ 22.7 $ 11.0 $ 15.8 $ 17.3
Less: Net income allocated to participating securities (0.3) (0.2) (0.3) (0.3)
Net income allocated to common shareholders $ 22.4 $ 10.8 $ 15.5 $ 17.0
Weighted average number of common shares outstanding 18,559,849 18,404,236 18,502,795 18,325,383
Dilutive potential common shares outstanding:        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 299,484 257,182 333,418 312,097
Diluted weighted-average shares 18,859,333 18,661,418 18,836,213 18,637,480