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MISCELLANEOUS INCOME (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Schedule of miscellaneous income
Total miscellaneous income was as follows at December 31:
(Millions)
 
2014
 
2013
 
2012
Equity portion of AFUDC
 
$
12.5

 
$
10.8

 
$
2.9

Federal excise tax credit
 
4.4

 
4.1

 
—

Gain on sale of land at the holding company
 
3.5

 
—

 
—

Key executive life insurance income for retired employees
 
2.9

 
2.2

 
2.6

Gains on exchange-traded funds
 
2.9

 
2.2

 
1.3

Other
 
4.8

 
2.6

 
2.2

Total miscellaneous income
 
$
31.0

 
$
21.9

 
$
9.0