COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of minimum future commitments related to purchase obligations

The following table shows our minimum future commitments related to these purchase obligations as of December 31, 2013.

				Payments Due By Period
(Millions)	Date Contracts Extend Through	Total Amounts Committed		2014		2015		2016		2017		2018		Later Years
Electric utility
Purchased power	2029	$	762.4	$	75.4	$	32.2	$	28.2	$	26.9	$	26.3	$	573.4
Coal supply and transportation	2018	99.5		46.3		31.0		12.0		6.7		3.5		—
Natural gas utility supply and transportation	2024	274.6		46.9		43.4		40.1		38.5		38.0		67.7
Total		$	1,136.5	$	168.6	$	106.6	$	80.3	$	72.1	$	67.8	$	641.1