Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other Tax Expense (Benefit)	$ 22.0	$ 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
Shares issued under employee stock purchase plan	339,807	321,429	326,634
Shares issued under employee purchase plan, Average price per share	$ 55.84	$ 57.72	$ 56.87
Performance Share Risk Free Rate Assumption	4.24%	1.76%	0.22%
Performance Share Volatility Rate Assumption	25.09%	27.34%	27.31%
Compensation Costs included in O&M Expense	$ 18.0	$ 29.0	$ 28.0
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	$ 61.44	$ 64.44	$ 58.02
Unrecognized compensation cost related to stock options expected to be recognized	$ 7.0
Weighted average period for recognizing unrecognized compensation cost	1 year 2 months 12 days
Total intrinsic value of restricted stock units vested	$ 54.0	$ 19.0	$ 17.0
Dividend equivalents accrued on stock units	29,174
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of granted shares	$ 67.99	$ 68.90	$ 65.57
Total intrinsic value of performance units vested	$ 95.0	$ 18.0	$ 28.0
Unrecognized compensation cost related to stock options expected to be recognized	$ 25.0
Weighted average period for recognizing unrecognized compensation cost	1 year 7 months 6 days
Dividend equivalents accrued on stock units	40,329
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	1,200,000
Outside Directors Stock Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Costs included in O&M Expense	$ 2.0	$ 2.0
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] \| 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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