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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
Description
Balance at
Beginning
of Year
 
Additions
Charged
to Costs
and
Expenses
 
Reductions (1)
 
Balance at
End of
Year
(millions)
 
 
 
 
 
 
 
Allowance for doubtful accounts
 

 
 

 
 

 
 

Year ended December 31, 2019
$
1.0

 
$
2.1

 
$
(1.2
)
 
$
1.9

Year ended December 31, 2018
0.7

 
1.7

 
(1.4
)
 
1.0

Year ended December 31, 2017
0.4

 
0.7

 
(0.4
)
 
0.7

Deferred tax valuation allowance
 

 
 

 
 

 
 

Year ended December 31, 2019
$
8.1

 
$
0.2

 
$
—

 
$
8.3

Year ended December 31, 2018
7.1

 
1.0

 
—

 
8.1

Year ended December 31, 2017
6.6

 
0.5

 
—

 
7.1


(1)
Represents uncollectible accounts written off and reversal of provision.