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Earnings per Share - EPS Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]      
Income from Continuing Operations $ 85.1 $ 55.5 $ 6.4
Undistributed Earnings Allocated to Participating Securities - Continuing Operations (1.5) (0.9) (0.1)
Income from continuing operations allocated to common shareholders $ 83.6 $ 54.6 $ 6.3
Weighted Average Number of Shares Outstanding, Basic 18,738,905 18,549,011 18,395,987
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]      
Share-based Awards For Diluted Earnings Per Share Calculation 275,490 385,819 291,367
Diluted weighted-average shares 19,014,395 18,934,830 18,687,354