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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,720.8	$ 1,665.3
Add: Earnings (loss) from equity method investment	39.8	36.1
Add: Capital contributions	3.0	3.4
Less: Distributions	40.6	34.2
Less: Return of capital	5.3
Investment in transmission affiliates, balance at end of period	$ 1,717.7	1,670.6
ATC
Investment in transmission affiliates
Equity method investment, ownership interest (as a percent)	60.00%
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,684.7	1,625.3
Add: Earnings (loss) from equity method investment	39.6	36.5
Add: Capital contributions	3.0	3.0
Less: Distributions	40.6	34.2
Less: Return of capital	0.0
Investment in transmission affiliates, balance at end of period	$ 1,686.7	1,630.6
ATC Holdco
Investment in transmission affiliates
Equity method investment, ownership interest (as a percent)	75.00%
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 36.1	40.0
Add: Earnings (loss) from equity method investment	0.2	(0.4)
Add: Capital contributions	0.0	0.4
Less: Distributions	0.0	0.0
Less: Return of capital	5.3
Investment in transmission affiliates, balance at end of period	$ 31.0	$ 40.0

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