COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2015

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 March 31, 2015, including those of our subsidiaries.

				Payments Due By Period
(Millions)	Year Contracts Extend Through	Total Amounts Committed		2015		2016		2017		2018		2019		Later Years
Natural gas utility supply and transportation	2028	$	664.6	$	128.8	$	171.7	$	134.4	$	79.6	$	52.3	$	97.8
Electric utility
Purchased power	2029	806.1		92.1		42.7		53.3		55.9		57.1		505.0
Coal supply and transportation	2019	155.8		44.3		34.8		33.5		32.1		11.1		—
Total		$	1,626.5	$	265.2	$	249.2	$	221.2	$	167.6	$	120.5	$	602.8