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Income Taxes (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2015
Mar. 18, 2013
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Unrecognized tax benefits $ 55.5  
Unrecognized Tax Benefits That Would Impact Effective Tax Rate 39.1  
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued 8.7  
Unrecognized Tax Benefits Period Increase Decrease 4.9  
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit 6.7  
Full Value of Warrants $ 2,421.5 $ 242.4