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Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
(Millions)
Description
 
Balance at
Beginning
of Period
 
Additions
Charged to
Costs and
Expenses
 
Deductions (1)
 
Balance at
End of
Period
Allowance for doubtful accounts (deducted from accounts and notes receivable):
 
 
 
 
 
 
 
 
Year Ended December 31, 2014
 
$
28.3

 
$
2.7

 
$
(0.9
)
 
$
30.1

Year Ended December 31, 2015
 
$
30.1

 
$
3.0

 
$
(12.0
)
 
$
21.1

Year Ended December 31, 2016
 
$
21.1

 
$
2.2

 
$
(0.5
)
 
$
22.8

(1)
Includes write-off of bad debts less recoveries, reclassifications from other current liabilities and foreign currency translation adjustments.