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Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2019
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, 2017, 2018 and 2019
 
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
 
Acquisitions
 
 Balance at
End of Year
Allowances for doubtful accounts receivable:
 
 

 
 
 
 

Year 2017
 
$
4.7

 
$
1.5

 
$
(3.5
)
 
$
1.9

 
$
4.6

Year 2018
 
$
4.6

 
$
—

 
$
(1.4
)
 
$
1.6

 
$
4.8

Year 2019
 
$
4.8

 
$
3.4

 
$
(0.5
)
 
$
—

 
$
7.7

Allowance for credit memos, returns and cash discounts:
 
 

 
 
 
 

Year 2017
 
$
45.9

 
$
260.8

 
$
(256.3
)
 
$
0.1

 
$
50.5

Year 2018
 
$
50.5

 
$
278.0

 
$
(293.5
)
 
$
0.1

 
$
35.1

Year 2019
 
$
35.1

 
$
299.1

 
$
(298.2
)
 
$
—

 
$
36.0

Valuation allowance on deferred tax assets:
 
 

 
 
 
 

Year 2017
 
$
22.6

 
$
(3.2
)
 
$
—

 
$
—

 
$
19.4

Year 2018
 
$
19.4

 
$
0.7

 
$
—

 
$
1.7

 
$
21.8

Year 2019
 
$
21.8

 
$
7.2

 
$
—

 
$
—

 
$
29.0