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Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Other Tax Expense (Benefit) | $ 2.0 | $ 2.0 | $ 2.0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 8,000,000 |  |
Percentage Of Fair Market Value Being Expected Purchase Price Of Employee Stock Purchase Plan | 95.00% |  |
Minimum Holding Period for Stock Purchased through Employee Stock Purchase Plan | 3 months |  |
Percentage Of Fair Market Value Being Expected Purchase Price Of Employee Stock Purchase Plan Non Represented | 90.00% |  |
Maximum Percentage Limit Of Base Pay For Employees For Purchasing Shares | 10.00% |  |
Employee Stock Ownership Plan (ESOP), Compensation Expense | $ 2.0 | $ 2.0 | $ 1.0
Shares issued under employee stock purchase plan | 321,429 | 326,634 | 373,682
Shares issued under employee purchase plan, Average price per share | $ 57.72 | $ 56.87 | $ 47.26
Performance Share Risk Free Rate Assumption | 1.76% | 0.22% | 1.36%
Performance Share Volatility Rate Assumption | 27.34% | 27.31% | 15.00%
Compensation Costs included in O&M Expense | $ 29.0 | $ 28.0 | $ 35.0
Various [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 7,000,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of granted shares | $ 64.44 | $ 58.02 | $ 58.85
Unrecognized compensation cost related to stock options expected to be recognized | $ 6.0 |  |
Weighted average period for recognizing unrecognized compensation cost | 1 year 1 month 6 days |  |
Total intrinsic value of restricted stock units vested | $ 19.0 | $ 17.0 | $ 11.0
Dividend equivalents accrued on stock units | 26,904 |  |
Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of granted shares | $ 68.90 | $ 65.57 | $ 51.79
Total intrinsic value of performance units vested | $ 18.0 | $ 28.0 | $ 19.0
Unrecognized compensation cost related to stock options expected to be recognized | $ 27.0 |  |
Weighted average period for recognizing unrecognized compensation cost | 1 year 8 months 12 days |  |
Dividend equivalents accrued on stock units | 41,862 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 100.00% |  |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,600,000 |  |
Outside Directors Stock Compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation Costs included in O&M Expense | $ 2.0 |  |
Minimum | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 1 year |  |
Minimum | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 3 years |  |
Minimum | Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 0.00% |  |
Maximum [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Maximum [Member] | Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 200.00% |  |

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