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EQUITY METHOD INVESTMENTS (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
ATC
Related party transactions
Revenues from services provided to related party	$ 11.3	$ 12.5	$ 13.5
Expenses related to services received from related party	104.9	100.3	102.7
WRPC
Related party transactions
Revenues from services provided to related party	0.9	0.8	0.7
Expenses related to services received from related party	3.7	5.0	4.9
Net amounts received from (advanced to) related party	$ 0	$ 2.9	$ 4.7
Number of hydroelectric plants operated	2
Portion of the energy output sold to WPS	50.00%
Remaining portion of the energy output sold to Wisconsin Power and Light	50.00%

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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