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GOODWILL (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2018		$ 3,053.5
Goodwill balance as of September 30, 2018	$ 3,052.8	3,052.8
Accumulated impairment losses	0.0	0.0
Amount of impairment from goodwill test	0.0
Bluewater
Changes to our goodwill balances by segment
Adjustment to Bluewater purchase price allocation		(0.7)
Wisconsin
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2018		2,104.3
Goodwill balance as of September 30, 2018	2,104.3	2,104.3
Wisconsin | Bluewater
Changes to our goodwill balances by segment
Adjustment to Bluewater purchase price allocation		0.0
Illinois
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2018		758.7
Goodwill balance as of September 30, 2018	758.7	758.7
Illinois | Bluewater
Changes to our goodwill balances by segment
Adjustment to Bluewater purchase price allocation		0.0
Other States
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2018		183.2
Goodwill balance as of September 30, 2018	183.2	183.2
Other States | Bluewater
Changes to our goodwill balances by segment
Adjustment to Bluewater purchase price allocation		0.0
Non-Utility Energy Infrastructure
Changes to our goodwill balances by segment
Goodwill balance as of January 1, 2018		7.3
Goodwill balance as of September 30, 2018	$ 6.6	6.6
Non-Utility Energy Infrastructure | Bluewater
Changes to our goodwill balances by segment
Adjustment to Bluewater purchase price allocation		$ (0.7)

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