SHARE-BASED COMPENSATION - SHARE-BASED COMPENSATION EXPENSE/ OPTIONS (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares authorized for issuance (in shares)	15,400,000
Number of shares available for future grants (in shares)	7,628,467
Share-based compensation expense, before income taxes	$ 77.0	$ 71.0	$ 61.0
Income tax benefit	(9.0)	(9.0)	(17.0)
Share-based compensation expense, net	68.0	62.0	44.0
Capitalized share-based compensation cost	13.0	12.0	11.0
Excess income tax (benefit) deficiency	$ (9.0)	$ (6.0)	$ (3.0)
Non-qualified stock options granted (in shares)	414,812	326,574	439,796
Exercised Options, Net Settlement	(23,713)
Stock option exercise period (in years)	3 years
Weighted-average fair value for options granted (in dollars per share)	$ 16.43	$ 17.50	$ 10.99
Stock price volatility (as a percent)	26.49%	27.35%	26.08%
Expected term (in years)	5 years 4 months 9 days	5 years 4 months 9 days	5 years 4 months 9 days
Risk-free rate of return (as a percent)	3.90%	3.89%	1.40%
Annual dividend yield (as a percent)	3.14%	2.98%	3.33%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)	1,759,798
Options granted in period (in shares)	414,812	326,574	439,796
Exercised (in shares)	$ (9.0)	$ 0.0	$ 0.0
Withheld related to net settlement (in shares)	(120,231)
Ending balance (in shares)	2,030,666	1,759,798
Vested at period end (in shares)	2,030,666
Exercisable at period end (in shares)	1,251,544
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (in dollars per share)	$ 65.99
Granted (in dollars per share)	75.82
Exercised (in dollars per share)	62.87
Withheld related to net settlement (in dollars per share)	62.87
Ending balance (in dollars per share)	68.22	$ 65.99
Vested at period end, Weighted- average exercise price (in dollars per share)	68.22
Exercisable at period end, Weighted- average exercise price (in dollars per share)	$ 64.45
Outstanding at period end, Weighted- average remaining contractual term	6 years 9 months 10 days
Vested at period end, Weighted- average remaining contractual term	6 years 9 months 10 days
Exercisable at period end, Weighted- average remaining contractual term	5 years 9 months 21 days
Outstanding at period end, Aggregate intrinsic value	$ 40.0
Vested at period end, Aggregate intrinsic value	40.0
Exercisable at period end, Aggregate intrinsic value	29.0
Aggregate intrinsic value of options exercised	$ 4.4	$ 0.0	$ 1.7
Weighted average period over which unrecognized compensation cost will be recognized (in years)	7 months 6 days
Weighted-average per share fair value for nonqualified stock options granted (in dollars per share)		$ 76.86	$ 66.00
Cash received from exercise of options			$ 4.0
SDG&E
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense, before income taxes	$ 12.0	$ 13.0	11.0
Income tax benefit	(2.0)	(2.0)	(3.0)
Share-based compensation expense, net	10.0	11.0	8.0
Capitalized share-based compensation cost	7.0	7.0	6.0
Excess income tax (benefit) deficiency	(1.0)	(1.0)	0.0
SoCalGas
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense, before income taxes	20.0	18.0	17.0
Income tax benefit	(4.0)	(3.0)	(5.0)
Share-based compensation expense, net	16.0	15.0	12.0
Capitalized share-based compensation cost	6.0	5.0	5.0
Excess income tax (benefit) deficiency	$ (2.0)	$ (1.0)	$ 0.0
Share-based Payment Arrangement, Option
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period	3 years
Expiration period	10 years
Performance Shares
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period	3 years
Award vesting rights maximum additional award	100.00%
Restricted Stock Units (RSUs), Service-based
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period	3 years
Minimum | Restricted Stock Units (RSUs), Service-based
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	3 years