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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions	1 Months Ended		3 Months Ended	15 Months Ended
	Apr. 30, 2019 degreecelsius	Dec. 31, 2018 change	Mar. 31, 2020 USD ($) generating_units States	Mar. 31, 2019 MW	Dec. 31, 2019 USD ($)
Manufactured gas plant remediation
Regulatory assets			$ 3,578.8		$ 3,527.6
Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets			$ 686.4		685.5
Mercury and Air Toxics Standards | Electric
Air quality
Revisions to Mercury and Air Toxics Standards | change		0
Climate Change | Electric
Air quality
Number of states challenging the ACE rule | States			22
Company goal for percentage of carbon dioxide emissions reduction by 2030				40.00%
Capacity of coal generation retired, in megawatts | MW				1,800
Per mile rate of methane emission reduction			30.00%
Climate Change | Electric | Maximum
Air quality
Global temperature increases limit | degreecelsius	2
Steam Electric Effluent Limitation Guidelines | Electric
Water quality
Number of generating units of OCPP and ERGS | generating_units			6
Expected cost to achieve required emissions reductions			$ 60.0
Manufactured Gas Plant Remediation | Natural gas
Manufactured gas plant remediation
Reserves for future environmental remediation			589.4		589.2
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets			$ 686.4		$ 685.5

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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