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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 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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