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Special Charges (Tables)
6 Months Ended
Mar. 31, 2020
Special Charges [Abstract]  
Restructuring Activity The reserve activity for severance and other benefits for the six months ended March 31, 2020 was as follows:
Balance as of September 30, 2019$8.5  
Expenses4.4  
Cash Payments(7.8) 
Reversals(0.3) 
Balance as of March 31, 2020$4.8