Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2012
Income Taxes  
Discrete tax charge $ 3.0
Effective tax rate before discrete charge (as a percent) 0.38
Effective tax rate (as a percent) 43.30%
Discrete tax charge related to the correction of an error $ 1.6