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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