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

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Period Type:	instant

- References

No definition available.

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
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- Definition

The capacity, in megawatts, of coal generation retired

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- Definition

The capital and operating costs needed to achieve the required level of reduction in emissions.

+ References

No definition available.

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-- None. No documentation exists for this element. --

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-- None. No documentation exists for this element. --

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- Definition

Represents the number of states that are challenging the ACE rule in D.C. Circuit Court of Appeals.

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- Definition

Represents the per mile rate of methane emission reduction from the natural gas distribution lines in our network by the year 2030 from a 2011 baseline.

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- Definition

The percentage by which the company plans to reduce carbon dioxide emissions below 2005 levels by 2030.

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The percentage by which the company plans to reduce carbon dioxide emissions below 2005 levels by 2030.

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- Definition

Represents the number of revisions to Mercury and Air Toxics Standards

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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended	15 Months Ended
	May 31, 2020 numberOfRevisions	Jun. 30, 2020 USD ($) States	Dec. 31, 2019 USD ($)	Mar. 31, 2019 MW
Manufactured gas plant remediation
Regulatory assets		$ 430.7	$ 437.9
Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets		$ 112.8	$ 113.5
Mercury and Air Toxics Standards \| Electric
Air quality
Revisions to mercury and air toxics standards \| numberOfRevisions	0
Climate Change \| Electric
Air quality
Number of states challenging the ACE rule \| States		22
Company goal percentage met in 2019 for carbon dioxide emissions reduction below 2005 levels			40.00%
Company goal for percentage of carbon dioxide emission reduction below 2005 levels by 2030		70.00%
Capacity of coal generation retired, in megawatts \| MW				300
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
Expected cost to achieve required emissions reduction		$ 10.0
Manufactured Gas Plant Remediation \| Natural gas
Manufactured gas plant remediation
Reserves for future environmental remediation		83.8	$ 83.8
Manufactured Gas Plant Remediation \| Natural gas \| Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets		$ 112.8	$ 113.5