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Valuation and Qualifying Accounts and Reserves
12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts and Reserves
Valuation and Qualifying Accounts and Reserves for the Years Ended December 31, 2019, 2020 and 2021
 
Reserves deducted in the balance sheet from the assets to which they apply (in millions):
 
 Balance
at Beginning
of Year
Additions / (Reversals)
Charged to Costs and
Expenses
 Deductions
 Balance at
End of Year
Allowances for doubtful accounts receivable:  
Year 2019$4.4 $2.8 $(0.4)$6.8 
Year 2020(a)
$8.0 $4.0 $(1.4)$10.6 
Year 2021$10.6 $2.0 $(2.0)$10.6 
Allowance for credit memos, returns and cash discounts:  
Year 2019$32.7 $280.6 $(279.8)$33.5 
Year 2020$33.5 $267.9 $(269.5)$31.9 
Year 2021$31.9 $296.5 $(293.7)$34.7 
Valuation allowance on deferred tax assets:  
Year 2019$19.2 $6.7 $— $25.9 
Year 2020$25.9 $3.6 $— $29.5 
Year 2021$29.5 $3.1 $— $32.6 
 (a) The cumulative effect of the adoption of ASC 326 resulted in a $1.2 million increase to the opening balance.