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RELATED PARTY TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2014
Related Party Transactions [Abstract]  
Schedule of information related to transactions entered into with related parties
The table below includes information summarizing transactions entered into with related parties as of:
(Millions)
 
December 31, 2014
 
December 31, 2013
Notes payable *
 
 

 
 

Integrys Energy Group
 
$
5.4

 
$
6.3

Accounts Payable
 
 

 
 

ATC
 
8.2

 
10.4

Liability related to income tax allocation
 
 

 
 

Integrys Energy Group
 
6.1

 
6.7


*
WPS Leasing, our consolidated subsidiary, has a note payable to our parent company, Integrys Energy Group. At December 31, 2014, the current portion of the note payable was $2.5 million.
Schedule of Related Party Transactions [Table Text Block]
The following table shows activity associated with related party transactions:
(Millions)
 
2014
 
2013
 
2012
Electric transactions
 
 

 
 

 
 

Sales to UPPCO (1)
 
$
15.3

 
$
22.8

 
$
22.2

Sales to Integrys Transportation Fuels, LLC
 
0.1

 
—

 
—

Natural gas transactions (2)
 
 

 
 

 
 

Sales to IES
 
0.6

 
0.5

 
0.6

Purchases from IES
 
2.5

 
0.9

 
0.7

Interest expense (3)
 
 

 
 
 
 
Integrys Energy Group
 
0.5

 
0.5

 
0.5

Transactions with equity-method investees
 
 

 
 

 
 

Charges from ATC for network transmission services
 
99.0

 
98.4

 
94.2

Charges to ATC for services and construction
 
8.6

 
9.5

 
10.4

Net proceeds from WRPC sales of energy to MISO
 
—

 
—

 
2.9

Purchases of energy from WRPC
 
3.7

 
3.7

 
5.0

Charges to WRPC for operations
 
1.4

 
0.9

 
0.8

Equity earnings from WPS Investments, LLC (4)
 
9.5

 
10.2

 
10.2


(1) 
Includes sales through the date of the sale of UPPCO in August 2014, by Integrys Energy Group.

(2) 
Includes sales and purchases through the date of the sale of IES in November 2014, by Integrys Energy Group.

(3) 
WPS Leasing, our consolidated subsidiary, has a note payable to our parent company, Integrys Energy Group.

(4) 
WPS Investments, LLC is a consolidated subsidiary of Integrys Energy Group that is jointly owned by Integrys Energy Group and us. At December 31, 2014, we had an 10.98% interest in WPS Investments accounted for under the equity method. Our ownership percentage has continued to decrease as additional equity contributions are made by Integrys Energy Group to WPS Investments.