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Special Charges (Tables)
 12 Months Ended
Sep. 30, 2018
Special Charges [Abstract]  
Restructuring Activity
The reserve activity for severance and other benefits in fiscal 2018 and 2017 was as follows:
Balance as of September 30, 2016
$
14.7

Expenses
9.7

Cash Payments
(14.3
)
Reversals
(1.1
)
Balance as of September 30, 2017
9.0

Expenses
21.3

Cash Payments
(20.9
)
Reversals
(0.9
)
Balance as of September 30, 2018
$
8.5