Summary of Significant Accounting Policies - Schedule of Error Correction and Prior Period Adjustment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Comprehensive Income (Loss), Net of Tax	$ 26.9	$ 2.1	$ 92.8	$ (11.8)
Correction of Error
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Comprehensive Income (Loss), Net of Tax	57.8		10.7
Recorded Amount Prior To Error Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other Comprehensive Income (Loss), Net of Tax	$ (30.9)		$ 82.1