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Special Charges (Tables)
 12 Months Ended
Sep. 30, 2019
Special Charges [Abstract]  
Restructuring Activity The reserve activity for severance and other benefits in fiscal 2019 and 2018 was as follows:
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

Expenses
16.4

Cash Payments
(15.1
)
Reversals
(1.3
)
Balance as of September 30, 2019
$
8.5