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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Disclosure of changes in asset retirement obligations
The following table shows changes to our asset retirement obligations through December 31, 2013:
(Millions)
 
 
 
Asset retirement obligations at December 31, 2010
 
$
18.8

 
Accretion
 
1.1

 
Revisions to estimated cash flows
 
(1.3
)
 
Asset retirement obligations at December 31, 2011
 
18.6

 
Accretion
 
1.0

 
Revisions to estimated cash flows
 
(2.5
)
*
Settlements
 
(0.4
)
 
Asset retirement obligations at December 31, 2012
 
16.7

 
Accretion
 
0.9

 
Revisions to estimated cash flows
 
0.5

 
Settlements
 
(0.1
)
 
Asset retirement obligations at December 31, 2013
 
$
18.0

 

*
Revisions were made to estimated cash flows related to asset retirement obligations for the PCB transformers primarily due to changes in estimated removal costs, estimated settlement date, and transformer quantities.