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MISCELLANEOUS INCOME (Tables)
 12 Months Ended
Dec. 31, 2013
Other Income and Expenses [Abstract]  
Components of miscellaneous income
Total miscellaneous income was as follows at December 31:
(Millions)
 
2013
 
2012
 
2011
Equity portion of AFUDC
 
$
10.8

 
$
2.9

 
$
0.7

Seams elimination charge adjustment (SECA) settlement at Integrys Energy Services
 
5.7

 
—

 
—

Federal excise tax credit
 
4.1

 
—

 
—

Key executive life insurance income for retired employees
 
2.2

 
2.6

 
2.3

Gains (losses) on exchange-traded funds held at IBS
 
2.2

 
1.3

 
(0.1
)
Other
 
4.8

 
2.5

 
2.4

Total miscellaneous income
 
$
29.8

 
$
9.3

 
$
5.3