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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS

Allowance for Doubtful Accounts
 
Balance at Beginning of the Period
 
Expense
 
Deferral
 
Net Write-offs
 
Balance at End of the Period
 
 
(Millions of Dollars)
December 31, 2014
 
$
61.0

 
$
49.8

 
$
18.4

 
$
(54.7
)
 
$
74.5

December 31, 2013
 
$
58.0

 
$
49.4

 
$
0.4

 
$
(46.8
)
 
$
61.0

December 31, 2012
 
$
61.7

 
$
47.7

 
$
(4.0
)
 
$
(47.4
)
 
$
58.0