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Schedule II - Valuation and Qualifying Accounts Summary of Valuation Allowances (Tables)
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
($ in millions)
Classification
Balance at
Beginning of
Period (a)
 
Charged to
Costs &
Expenses
 
Impact of
Currency
 
Write Offs,
Write Downs  &
Deductions
 
Balance at End of Period (a)
Year ended December 31, 2018:
 
 
 
 
 
 
 
 
 
Allowances deducted from asset account
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
17.9

 
$
4.7

 
$
(0.7
)
 
$
(4.0
)
 
$
17.9

Year ended December 31, 2017:
 
 
 
 
 
 
 
 
 
Allowances deducted from asset account
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
17.9

 
$
5.8

 
$
0.7

 
$
(6.5
)
 
$
17.9

Year ended December 31, 2016:
 
 
 
 
 
 
 
 
 
Allowances deducted from asset account
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
16.0

 
$
3.5

 
$
0.5

 
$
(2.1
)
 
$
17.9

______________
(a) 
Amounts include allowance for doubtful accounts classified as current.