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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended	15 Months Ended
	May 31, 2020 numberOfRevisions	Sep. 30, 2020 USD ($) generating_units States MW	Dec. 31, 2019 USD ($)	Mar. 31, 2019 MW
Manufactured gas plant remediation
Regulatory assets		$ 3,484.4	$ 3,527.6
Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets		$ 696.6	$ 685.5
Mercury and Air Toxics Standards | Electric
Air quality
Revisions to mercury and air toxics standards | numberOfRevisions	0
Climate Change
Air quality
Capacity of fossil-fueled generation to be retired by 2025, in megawatts | MW		1,800
Climate Change | Electric
Air quality
Number of states challenging the ACE rule | States		22
Capacity of coal generation retired, in megawatts | MW				1,800
Company goal for percentage of carbon dioxide emissions reduction below 2005 levels by 2025		55.00%
Company goal percentage met in 2019 for carbon dioxide emissions reduction below 2005 levels			40.00%
Company goal for percentage of carbon dioxide emissions reduction below 2005 levels by 2030		70.00%
Climate Change | Natural gas
Air quality
Percentage of per mile methane emission reduction by 2030 from a 2011 baseline		30.00%
Steam Electric Effluent Limitation Guidelines | Electric
Water quality
Number of generating units of OCPP and ERGS | generating_units		6
Expected cost to achieve required discharge limits		$ 60.0
Number of years that the average capacity utilization rating is based on		2 years
Steam Electric Effluent Limitation Guidelines | Electric | Maximum
Water quality
Limit for two-year average annual capacity utilization rating		10.00%
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		$ 696.6	$ 685.5

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

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