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Special Charges (Tables)
12 Months Ended
Sep. 30, 2020
Special Charges [Abstract]  
Restructuring Activity
Balance as of September 30, 2018$8.5 
Expenses16.4 
Cash Payments(15.1)
Reversals(1.3)
Balance as of September 30, 2019$8.5 
Expenses14.6 
Cash Payments(11.1)
Reversals(0.7)
Balance as of September 30, 2020$11.3