GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of identifiable intangible assets other than goodwill

Our intangible assets consist of contractual service agreements that provide for major maintenance and protection against unforeseen maintenance costs related to the combustion turbine generators at the Fox Energy Center. These contractual service agreements are included in other long-term assets on the balance sheets.

	June 30, 2014							December 31, 2013
(Millions)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortized intangible assets
Contractual service agreements *	$	15.6	$	(3.0	)	$	12.6	$	15.6	$	(1.8	)	$	13.8

* The remaining amortization period for these intangible assets at June 30, 2014, was approximately six years.

Schedule of intangible asset amortization expense

The table below shows our amortization expense recognized in the statements of income:

	Three Months Ended June 30				Six Months Ended June 30
(Millions)	2014		2013		2014		2013
Amortization recorded in depreciation and amortization expense	$	0.6	$	0.6	$	1.2	$	0.6

Schedule of intangible asset amortization expense for the next five years

The following table shows our estimated amortization expense for the next five years, including amounts recorded through June 30, 2014:

	For the Year Ending December 31
(Millions)	2014		2015		2016		2017		2018
Amortization to be recorded in depreciation and amortization expense	$	2.2	$	2.2	$	2.2	$	2.2	$	2.2