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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Account SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS
Years Ended December 31, 2018, 2017, and 2016

Allowance for Doubtful Accounts (in millions)
 
Balance at
Beginning
of Year
 
Charged to Cost and
Expense (1)
 
Accounts
Written Off
 
Balance at
End of Year
Year Ended December 31, 2018
 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
 
$
0.7

 
(0.1
)
 
—

 
$
0.6

Year Ended December 31, 2017
 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
 
$
1.5

 
0.2

 
(1.0
)
 
$
0.7

Year Ended December 31, 2016
 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
 
$
1.5

 
0.1

 
(0.1
)
 
$
1.5

(1) Net of recoveries on previously reserved or written-off balances.
 
 

 
 

 
 
 
 
 
 
 
 
 
Deferred Tax Valuation Allowance (in millions)
 
Balance at
Beginning
of Year
 
Additions
 
Reductions
 
Balance at
End of Year
Year Ended December 31, 2018
 
 
 
 
 
 
 
 
Deferred Tax Valuation Allowance
 
$
99.7

 
31.5

 
—

 
$
131.2

Year Ended December 31, 2017
 
 
 
 
 
 
 
 
Deferred Tax Valuation Allowance
 
$
161.3

 
—

 
(61.6
)
 
$
99.7

Year Ended December 31, 2016
 
 
 
 
 
 
 
 
Deferred Tax Valuation Allowance
 
$
127.4

 
33.9

 
—

 
$
161.3