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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation [Abstract]  
ASSET RETIREMENT OBLIGATIONS
ASSET RETIREMENT OBLIGATIONS

AROs have been recorded for asbestos abatement at certain generation and substation facilities, and for obligations associated with the removal and dismantlement of generation facilities. AROs are recorded in other long-term liabilities on the Consolidated Balance Sheets. The following table presents the change in our AROs during 2013 and 2012:

 
2013
 
2012
 
(Millions of Dollars)
 
 
 
 
Balance as of January 1
$
44.3

 
$
55.5

Liabilities Settled
(4.4
)
 
(14.0
)
Accretion
2.4

 
2.8

Balance as of December 31
$
42.3

 
$
44.3