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Other Income and Expenses (Tables)
 12 Months Ended
Sep. 30, 2023
Other Income and Expenses [Abstract]  
Restructuring and Related Costs
Activity in accrued restructuring, reported as part of other current liabilities, is presented below.
202320222021
(in millions)
Beginning balance$3.3 $3.1 $2.8 
   Expenses incurred10.2 7.2 5.4 
   Amounts paid(6.9)(7.0)(5.1)
Ending balance$6.6 $3.3 $3.1 
Selected Supplemental Statement of Operations Information
Selected supplemental statement of operations information is presented below.

202320222021
(in millions)
Included in selling, general and administrative expenses:
Research and development$25.9 $24.5 $17.1 
Advertising$4.7 $5.5 $3.2 
Interest expense, net:
5.5% Senior Notes$— $— $17.6 
4.0% Senior Notes18.0 18.0 6.2 
Deferred financing costs amortization1.0 1.0 1.1 
ABL Agreement0.9 0.9 0.9 
   Capitalized interest(1.6)(2.6)(2.3)
Other interest expense0.1 0.3 0.3 
Total interest expense18.4 17.6 23.8 
Interest income(3.7)(0.7)(0.4)
Net interest expense$14.7 $16.9 $23.4