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Earnings per Share (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share        
Antidilutive options excluded from computation of diluted earnings per share 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount