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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions	1 Months Ended			6 Months Ended
	Feb. 28, 2026 MMBTU	May 31, 2024 MMBTU	Feb. 29, 2024 micrograms	Jun. 30, 2026 USD ($) performance_obligations MW	Dec. 31, 2025 USD ($)
Manufactured gas plant remediation
Regulatory assets				$ 449.5	$ 446.2
Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets				$ 128.9	133.5
Mercury and Air Toxics Standards \| Electric
Air quality
Previous limit for particulate matter, in pounds per million british thermal unit \| MMBTU		0.03
New limit for particulate matter published in the EPA's 2024 Amendments, in pounds per million british thermal unit \| MMBTU		0.01
Level of particulate matter in pounds per million british thermal unit that the EPA reverted back to with the repeal of the 2024 amendments \| MMBTU	0.03
National Ambient Air Quality Standards \| Electric
Air quality
Previous level of micrograms per cubic meter under 24-hour standard that particulate matter needed to be below \| micrograms			12
Period of time that the EPA may take to issue attainment designations				1 year
National Ambient Air Quality Standards \| Electric \| Maximum
Air quality
New primary annual PM2.5 level \| micrograms			9
Climate Change \| Electric
Air quality
Number of applicable GHG performance standards for coal plants \| performance_obligations				0
Capacity of coal-fired generation retired, in megawatts \| MW				400
Capacity of additional fossil-fueled generation to be retired by the end of 2031, in megawatts \| MW				900
Manufactured Gas Plant Remediation \| Natural gas
Manufactured gas plant remediation
Reserves for future environmental remediation				$ 104.4	104.7
Manufactured Gas Plant Remediation \| Natural gas \| Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets				$ 128.9	$ 133.5