Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Narrative (Details)

v2.4.1.9
Earnings Per Share - Narrative (Details)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Antidilutive securities excluded from computation of earnings per share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 0.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.6us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Performance-based stock awards (maximum that can be earned)    
Antidilutive securities excluded from computation of earnings per share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 1.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_PerformanceSharesMember
1.8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_PerformanceSharesMember