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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes to investments in transmission affiliates
Add: Earnings from equity method investment	$ 43.0	$ 41.3	$ 84.7	$ 83.9
Add: Capital contributions			30.3	0.0
Transmission Affiliates
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	1,818.2	1,773.6
Add: Earnings from equity method investment	43.0	41.3
Add: Capital contributions	9.2
Less: Distributions	33.2	32.8
Investment in transmission affiliates, balance at end of period	1,837.2	1,782.0	1,837.2	1,782.0
Transmission Affiliates
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period			1,789.4	1,764.3
Add: Earnings from equity method investment			84.7	83.9
Add: Capital contributions			30.3
Less: Distributions			67.2	66.2
Add: Other		(0.1)
Investment in transmission affiliates, balance at end of period	$ 1,837.2	1,782.0	$ 1,837.2	1,782.0
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	$ 1,795.0	1,741.9	$ 1,766.9	1,733.5
Add: Earnings from equity method investment	42.6	40.7	83.6	82.4
Add: Capital contributions	9.2		30.3
Less: Distributions	33.2	32.8	67.2	66.2
Add: Other		(0.1)
Investment in transmission affiliates, balance at end of period	$ 1,813.6	1,749.7	$ 1,813.6	1,749.7
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	$ 23.2	31.7	$ 22.5	30.8
Add: Earnings from equity method investment	0.4	0.6	1.1	1.5
Add: Capital contributions	0.0		0.0
Less: Distributions	0.0	0.0	0.0	0.0
Add: Other		0.0
Investment in transmission affiliates, balance at end of period	$ 23.6	$ 32.3	$ 23.6	$ 32.3

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