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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,696.5	$ 1,596.6	$ 1,665.3	$ 1,553.4
Add: Earnings (loss) from equity method investment	38.7	33.7	111.7	95.2
Add: Capital contributions	15.4	11.3	37.3	43.7
Less: Distributions	30.3	27.8	93.9	78.5
Other	0.1	0.1		0.1
Investment in transmission affiliates, balance at end of period	$ 1,720.4	1,613.7	$ 1,720.4	1,613.7
ATC
Investment in transmission affiliates
Equity method investment, ownership interest (as a percent)	60.00%		60.00%
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,656.6	1,558.4	$ 1,625.3	1,515.8
Add: Earnings (loss) from equity method investment	38.3	34.6	112.2	97.8
Add: Capital contributions	15.1	9.1	36.2	39.2
Less: Distributions	30.3	27.8	93.9	78.5
Other	0.1	0.1		0.1
Investment in transmission affiliates, balance at end of period	$ 1,679.8	1,574.2	$ 1,679.8	1,574.2
Dividends receivable from ATC		27.7		27.7	$ 39.9
ATC Holdco
Investment in transmission affiliates
Equity method investment, ownership interest (as a percent)	75.00%		75.00%
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 39.9	38.2	$ 40.0	37.6
Add: Earnings (loss) from equity method investment	0.4	(0.9)	(0.5)	(2.6)
Add: Capital contributions	0.3	2.2	1.1	4.5
Less: Distributions	0.0	0.0	0.0	0.0
Other	0.0	0.0		0.0
Investment in transmission affiliates, balance at end of period	$ 40.6	$ 39.5	$ 40.6	$ 39.5

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