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Shareholders' Equity - Share Repurchase Plan (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Schedule of Share Repurchases [Abstract]    
Stock Repurchased During Period, Shares 6,900 5,197
Stock Repurchased During Period, Weighted Average Price, Per Share $ 12.71 $ 12.62
Stock Redeemed or Called During Period, Value $ 87.7 $ 65.5