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VARIABLE INTEREST ENTITIES (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) MW	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Variable interest entities
Equity investment	$ 1,750.4	$ 1,744.7	$ 1,720.8	$ 1,720.4	$ 1,696.5	$ 1,665.3
ATC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity investment	$ 1,719.1		1,684.7
ATC Holdco
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity investment	$ 31.3		$ 36.1
Power purchase agreement
Variable interest entities
Firm capacity from power purchase agreement (in megawatts) | MW	236
Minimum energy requirements over remaining term of power purchase agreement (in megawatts) | MW	0
Remaining term of power purchase agreement (in years)	2 years
Residual guarantee associated with power purchase agreement	$ 0.0
Required payments over remaining term of power purchase agreement	$ 15.8

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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