COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 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 June 30, 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
Wisconsin Operations
Natural gas supply and transportation	2024	$	218.9	$	20.7	$	43.8	$	42.9	$	42.4	$	27.1	$	42.0
Electric
Purchased power	2029	816.3		61.4		78.9		54.1		56.8		58.1		507.0
Coal supply and transportation	2019	154.0		35.6		39.0		34.9		33.4		11.1		—
Illinois Operations
Natural gas supply and transportation	2022	$	191.3	$	39.5	$	76.7	$	49.2	$	14.1	$	4.0	$	7.8
Other States Operations
Natural gas supply and transportation	2028	$	215.5	$	26.2	$	52.9	$	43.4	$	23.7	$	21.2	$	48.1
Total		$	1,596.0	$	183.4	$	291.3	$	224.5	$	170.4	$	121.5	$	604.9

Schedule of reserves and regulatory assets related to manufactured gas plant sites

We established the following reserves and regulatory assets related to manufactured gas plant sites:

(Millions)	June 30, 2015		December 31, 2014
Regulatory assets	$	625.4	$	634.3
Reserves for future remediation	576.0		579.7