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GOODWILL (Details) $ in Millions	1 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2017		$ 3,046.2
Goodwill balance as of June 30, 2017	$ 3,053.5	3,053.5
Accumulated impairment losses	0.0	0.0
Bluewater
Changes to our goodwill balances by segment
Acquisition of Bluewater	7.3	7.3
Wisconsin
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2017		2,104.3
Goodwill balance as of June 30, 2017	2,104.3	2,104.3
Wisconsin | Bluewater
Changes to our goodwill balances by segment
Acquisition of Bluewater		0.0
Illinois
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2017		758.7
Goodwill balance as of June 30, 2017	758.7	758.7
Illinois | Bluewater
Changes to our goodwill balances by segment
Acquisition of Bluewater		0.0
Other States
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2017		183.2
Goodwill balance as of June 30, 2017	183.2	183.2
Other States | Bluewater
Changes to our goodwill balances by segment
Acquisition of Bluewater		0.0
Non-Utility Energy
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2017		0.0
Goodwill balance as of June 30, 2017	$ 7.3	7.3
Non-Utility Energy | Bluewater
Changes to our goodwill balances by segment
Acquisition of Bluewater		$ 7.3

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-SubTopic 20
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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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