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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Pay vs Performance Disclosure [Table]        
Pay vs Performance [Table Text Block]
        Value of Initial Fixed $100
Investment Based on:		    
 Fiscal Year
(a)*

 Summary Compensation Table Total

for PEO(1)

(b)

 Compensation Actually Paid to PEO(1)(2)

(c)

  Average Summary Compensation Table Total for non-PEO NEOs(1) (d) Average Compensation Actually Paid to non-PEO NEOs(1)(2)(e)

Total Shareholder

Return

(f)

Peer Group

Total Shareholder

Return(3)

(g)

 Net Income

(h)

 Adjusted

EPS(4)

(i)

2023 $7,749,950 $2,489,517 $1,471,777 $   856,685 $  87.70 $  89.38 $498,226,000 $2.00
2022 $4,569,047 $4,579,810 $1,569,825 $1,131,942 $108.77 $102.99 $465,237,000 $1.81
2021 $5,339,716 $5,944,071 $1,488,288 $1,779,964 $119.44 $103.14 $431,612,000 $1.80
2020 $7,173,359 $5,496,122 $1,770,429 $1,814,639 $102.93 $86.13 $284,490,000 $1.67
      
Named Executive Officers, Footnote [Text Block] Our principal executive officer (PEO) for 2021-2023 is Mr. Franklin.      
PEO Total Compensation Amount [1] $ 7,749,950 $ 4,569,047 $ 5,339,716 $ 7,173,359
PEO Actually Paid Compensation Amount [1],[2] 2,489,517 4,579,810 5,944,071 5,496,122
Non-PEO NEO Average Total Compensation Amount [1] 1,471,777 1,569,825 1,488,288 1,770,429
Non-PEO NEO Average Compensation Actually Paid Amount [1],[2] $ 856,685 1,131,942 1,779,964 1,814,639
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] The non-principal executive officers (Non-PEO) reflected in columns (d) and (e) include the following individuals: Mr. Schuller (2021-2023), , Mr. Rhodes (2021-2023), Mr. Luning (2021-2023), and Ms. Arnold (2022-2023).      
Compensation Actually Paid vs. Total Shareholder Return [Text Block]

 

 

      
Compensation Actually Paid vs. Net Income [Text Block]

 

 

      
Compensation Actually Paid vs. Company Selected Measure [Text Block]

 

 

      
Tabular List [Table Text Block]

Tabular List of Most Important Performance Measures

 

The five items listed below represent the most important performance metrics we used to determine CAP for FY2023 as further described in our Compensation Discussion and Analysis (CD&A) within the sections titled “Short-Term Incentive Awards” and “Long-Term Equity Incentive Awards.”

 

Most Important Performance Measures

     

•   Adjusted EPS

•   Return on Equity

•   Relative TSR

•   Operations & Maintenance Measures

•   Rate Base Growth

      
Total Shareholder Return Amount $ 87.70 108.77 119.44 102.93
Peer Group Total Shareholder Return Amount [3] 89.38 102.99 103.14 86.13
Net Income (Loss) Attributable to Parent $ 498,226,000 $ 465,237,000 $ 431,612,000 $ 284,490,000
Company Selected Measure Amount | $ / shares [4] 2.00 1.81 1.80 1.67
PEO Name Mr. Franklin      
PEO [Member] | Change In Actuarial Present Value Of Pension Plans Reported In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ (2,483,717) $ 0 $ (1,096,773) $ (3,008,515)
PEO [Member] | Service Cost Of Pension In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 106,388 138,759 145,149 105,108
PEO [Member] | Prior Service Cost Of Pension In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0 0
PEO [Member] | Grant Date Fair Value Of Stock Awards Granted In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (2,822,794) (2,384,982) (2,144,852) (2,053,175)
PEO [Member] | Fair Value At Fiscal Year End Of Outstanding Unvested Stock Awards Granted In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 2,641,275 3,584,530 3,173,125 2,677,987
PEO [Member] | Change In Fair Value Of Outstanding Unvested Stock Awards Granted In Prior Fiscal Years [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (2,662,913) (1,114,238) 913,795 341,454
PEO [Member] | Fair Value At Vesting Of Stock Awards Granted In Fiscal Year That Vested During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0 0
PEO [Member] | Change In Fair Value As Of Vesting Date Of Stock Awards Granted In Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (196,908) (408,431) (513,508) 144,032
PEO [Member] | Fair Value As Of Prior Fiscal Year End Of Stock Awards Granted In Prior Fiscal Years That Failed To Meet Applicable Vesting Conditions During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0 0
PEO [Member] | Dividends Accrued During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 158,236 195,125 127,419 115,872
Non-PEO NEO [Member] | Change In Actuarial Present Value Of Pension Plans Reported In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (101,818) (279,211) (169,224) (343,844)
Non-PEO NEO [Member] | Service Cost Of Pension In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 31,159 68,366 87,452 63,474
Non-PEO NEO [Member] | Prior Service Cost Of Pension In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0 0
Non-PEO NEO [Member] | Grant Date Fair Value Of Stock Awards Granted In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (533,779) (497,732) (505,411) (615,185)
Non-PEO NEO [Member] | Fair Value At Fiscal Year End Of Outstanding Unvested Stock Awards Granted In Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 514,573 558,334 747,714 813,607
Non-PEO NEO [Member] | Change In Fair Value Of Outstanding Unvested Stock Awards Granted In Prior Fiscal Years [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (516,479) (175,708) 231,197 82,955
Non-PEO NEO [Member] | Fair Value At Vesting Of Stock Awards Granted In Fiscal Year That Vested During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 56,413 0 0
Non-PEO NEO [Member] | Change In Fair Value As Of Vesting Date Of Stock Awards Granted In Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (39,641) (135,957) (131,958) 13,391
Non-PEO NEO [Member] | Fair Value As Of Prior Fiscal Year End Of Stock Awards Granted In Prior Fiscal Years That Failed To Meet Applicable Vesting Conditions During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 (68,996) 0 0
Non-PEO NEO [Member] | Dividends Accrued During Fiscal Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ 30,894 $ 36,609 $ 31,907 $ 29,810
Measure [Axis]: 1        
Pay vs Performance Disclosure [Table]        
Measure Name Adjusted EPS      
Non-GAAP Measure Description [Text Block] Adjusted EPS is a non-GAAP financial measure. See Appendix A for reconciliation to the GAAP financial measure and adjustments.      
Measure [Axis]: 2        
Pay vs Performance Disclosure [Table]        
Measure Name Return on Equity      
Measure [Axis]: 3        
Pay vs Performance Disclosure [Table]        
Measure Name Relative TSR      
Measure [Axis]: 4        
Pay vs Performance Disclosure [Table]        
Measure Name Operations & Maintenance Measures      
Measure [Axis]: 5        
Pay vs Performance Disclosure [Table]        
Measure Name Rate Base Growth      
[1] Our principal executive officer (PEO) for 2021-2023 is Mr. Franklin. The non-principal executive officers (Non-PEO) reflected in columns (d) and (e) include the following individuals: Mr. Schuller (2021-2023), , Mr. Rhodes (2021-2023), Mr. Luning (2021-2023), and Ms. Arnold (2022-2023).
[2] The following amounts were deducted from / added to Summary Compensation Table (SCT) total compensation in accordance with the SEC-mandated adjustments to calculate Compensation Actually Paid (CAP) to our principal executive officer (PEO) and average CAP to our non-PEO named executive officers. The fair value of equity awards was determined using methodologies and assumptions developed in a manner substantively consistent with those used to determine the grant date fair value of such awards.
[3] The Peer Group for which Total Shareholder Return is provided in column (g) is the S&P Midcap 400 Utilities Index.
[4] Adjusted EPS is a non-GAAP financial measure. See Appendix A for reconciliation to the GAAP financial measure and adjustments.