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Equity (Performance Stock Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized stock-based compensation expense $ 1.0   $ 1.0    
Weighted average remaining service period (in years)     1 year 5 months 23 days    
Unvested stock units (in shares) 234,324   234,324   397,777
Intrinsic value of non-vested and expected to vest PSUs $ 0.9   $ 0.9    
Average remaining contractual term (in years)     1 year 5 months 23 days    
Vested (in shares) 0 0 30,874    
Weighted average fair value (in usd per share)     $ 0.00 $ 7.62  
Amount considered issued and outstanding (as percentage of target number of shares)     200.00%    
Performance Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized stock-based compensation expense $ 0.1   $ 0.1    
Weighted average remaining service period (in years)     6 months 18 days    
Unvested stock units (in shares) 33,333   33,333   33,333
Vested (in shares)     0    
Weighted average fair value (in usd per share)     $ 0.00