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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,744.7	$ 1,696.5	$ 1,720.8	$ 1,665.3
Add: Earnings (loss) from equity method investment	40.1	38.7	132.8	111.7
Add: Capital contributions	6.2	15.4	15.2	37.3
Less: Distributions	39.9	30.3	112.5	93.9
Less: Return of capital	0.6		5.9
Add: Other	(0.1)	0.1
Investment in transmission affiliates, balance at end of period	$ 1,750.4	1,720.4	$ 1,750.4	1,720.4
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	$ 1,713.3	1,656.6	$ 1,684.7	1,625.3
Add: Earnings (loss) from equity method investment	39.6	38.3	131.7	112.2
Add: Capital contributions	6.2	15.1	15.2	36.2
Less: Distributions	39.9	30.3	112.5	93.9
Less: Return of capital	0.0		0.0
Add: Other	(0.1)	0.1
Investment in transmission affiliates, balance at end of period	$ 1,719.1	1,679.8	$ 1,719.1	1,679.8
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	$ 31.4	39.9	$ 36.1	40.0
Add: Earnings (loss) from equity method investment	0.5	0.4	1.1	(0.5)
Add: Capital contributions	0.0	0.3	0.0	1.1
Less: Distributions	0.0	0.0	0.0	0.0
Less: Return of capital	0.6		5.9
Add: Other	0.0	0.0
Investment in transmission affiliates, balance at end of period	$ 31.3	$ 40.6	$ 31.3	$ 40.6

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