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Valuation and Qualifying Accounts
 12 Months Ended
Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts

Fiscal years ended September 30, 2021, 2020 and 2019

(In millions)
  ADDITIONS   
DESCRIPTIONBALANCE AS OF
BEGINNING
OF PERIOD		CHARGED TO
COSTS AND
EXPENSES		CHARGED TO
OTHER
ACCOUNTS		DEDUCTIONS
NET OF
RECOVERIES		 BALANCE
AS OF END
OF PERIOD
Reserves deducted from assets to which they apply:      
Allowance for possible losses and sales returns - accounts receivable:      
Fiscal Year Ended:      
September 30, 2021$25.9 $2.4 $5.7 1$(8.6)2$25.4 
September 30, 202020.6 8.8 (0.3)1(3.2)225.9 
September 30, 201921.8 5.0 0.7 1(6.9)220.6 
Valuation allowance against deferred tax assets:      
Fiscal Year Ended:      
September 30, 2021$50.8 $1.2 $1.1 $(0.1)$53.0 
September 30, 202045.0 4.6 0.5 30.7 50.8 
September 30, 201980.2 2.2 4.5 3(41.9)445.0 

1 Reduction of gross revenue for uncollectible health care rental reimbursements, cash discounts and other adjustments in determining net revenue. Also includes the effect of acquired businesses, if any.
2 Generally reflects the write-off of specific receivables against recorded reserves.
3 Generally reflects the effect of acquired businesses, if any.
4 Primarily reflects utilization of valuation allowance as a result of forfeitures on net operating losses.