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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts
for the fiscal year ended September 30, 2021
Column AColumn BColumn CColumn DColumn EColumn F
ClassificationBalance
at
Beginning
of Period		Reserves
Acquired		Additions
Charged
to
Expense		Deductions
Credited
and
Write-Offs		Balance
at End of
Period
 (In millions)
Valuation and qualifying accounts deducted from the assets to which they apply:
Allowance for doubtful accounts$7.5 $— $11.1 $(1.8)$16.8 
Income tax valuation allowance33.8 — 3.0 (4.5)32.3 


Schedule II—Valuation and Qualifying Accounts
for the fiscal year ended September 30, 2020
Column AColumn BColumn CColumn DColumn EColumn F
ClassificationBalance
at
Beginning
of Period		Reserves
Acquired		Additions
Charged
to
Expense		Deductions
Credited
and
Write-Offs		Balance
at End of
Period
 (In millions)
Valuation and qualifying accounts deducted from the assets to which they apply:
Allowance for doubtful accounts$4.2 $— $7.2 $(3.9)$7.5 
Income tax valuation allowance35.8 — 0.5 (2.5)33.8 


Schedule II—Valuation and Qualifying Accounts
for the fiscal year ended September 30, 2019
Column AColumn BColumn CColumn DColumn EColumn F
ClassificationBalance
at
Beginning
of Period		Reserves
Acquired		Additions
Charged
to
Expense		Deductions
Credited
and
Write-Offs		Balance
at End of
Period
 (In millions)
Valuation and qualifying accounts deducted from the assets to which they apply:
Allowance for doubtful accounts$3.6 $— $1.4 $(0.8)$4.2 
Income tax valuation allowance33.6 — 2.4 (0.2)35.8