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INVESTMENT IN AMERICAN TRANSMISSION COMPANY - CHANGES TO INVESTMENT (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Changes to investment in ATC
Investment in ATC, balance at beginning of period			$ 1,443.9
Add: Earnings from equity method investment	$ 41.8	$ 30.9	83.7	$ 69.4
Investment in ATC, balance at end of period	$ 1,544.0		$ 1,544.0
ATC
Investment in ATC
Ownership interest in ATC (as a percent)	60.00%		60.00%
Changes to investment in ATC
Investment in ATC, balance at beginning of period	$ 1,422.5	1,513.3	$ 1,443.9	1,380.9
Add: Earnings from equity method investment	41.8	30.9	83.7	69.4
Add: Capital contributions	22.9	3.1	50.5	12.1
Acquisition of Integrys's investment in ATC	0.0	(1.0)	0.0	(1.0)
Add: Adjustment to equity method goodwill	0.0	1.1	0.0	10.4
Less: Distributions	34.0	31.6	34.0	46.7
Less: Other	0.0	0.0	0.1	0.1
Investment in ATC, balance at end of period	$ 1,544.0	$ 1,425.0	$ 1,544.0	$ 1,425.0
Dividends Receivable					$ 35.2

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