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Schedule II: Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II: Valuation and Qualifying Accounts
Schedule II: Valuation and Qualifying Accounts
For the years ended December 31, 2017, 2016 and 2015

 (in millions)
 
Balance at
beginning of
period
 
Charged to
costs and
expenses
 
Utilization of
reserve
 
Other (1)
 
Balance at end
of period
Year End December 31, 2015
 
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
 
$
3.9

 
2.5

 
(2.2
)
 
(0.2
)
 
$
4.0

Deferred tax valuation allowance
 
$
113.1

 
(0.5
)
 
(28.2
)
 
(4.3
)
 
$
80.1

Year End December 31, 2016
 
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
 
$
4.0

 
1.7

 
(0.3
)
 
(0.1
)
 
$
5.3

Deferred tax valuation allowance
 
$
80.1

 
2.7

 
(18.2
)
 
(4.7
)
 
$
59.9

Year End December 31, 2017
 
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
 
$
5.3

 
(0.9
)
 
(0.7
)
 
0.3

 
$
4.0

Deferred tax valuation allowance
 
$
59.9

 
4.8

 
(18.9
)
 
(3.8
)
 
$
42.0

(1) Other changes to the balances for allowance for doubtful accounts and deferred tax valuation allowance are primarily the impact of foreign exchange rates in all periods presented except for the year ended December 31, 2017 where the deferred tax valuation allowance is primarily reflective of the impact of the change in the United States corporate statutory tax rate on capital loss carryforwards.