Annual report pursuant to Section 13 and 15(d)

Description of the Business (Details)

v3.5.0.2
Description of the Business (Details)
$ in Millions
12 Months Ended
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Number of reportable segments | segment 2    
Correction of Errors      
Reduction in operating expenses $ (346.5) $ (330.6) $ (383.1)
Recorded Adjustment      
Correction of Errors      
Reduction in operating expenses     2.0
Adjustment to correct a prior period error     $ 2.0