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SUBSEQUENT EVENT (Tables)
12 Months Ended
Dec. 31, 2013
Subsequent Events [Abstract]  
Balances of the assets and liabilities included in the disposal group
The following table shows the balances of the assets and liabilities of UPPCO that are included in the disposal group:
(Millions)
 
December 31, 2013
Current assets
 
$
26.5

Property, plant, and equipment, net of accumulated depreciation of $88.9 million
 
193.8

Other long-term assets
 
51.5

Total assets
 
$
271.8

 
 
 
Current liabilities
 
$
21.2

Long-term liabilities
 
$
32.4

Total liabilities
 
$
53.6