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Short-Term and Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Long-term Debt [Table Text Block]
Long-Term Debt  
As of December 3120222021
Millions  
First Mortgage Bonds
3.40% Series Due 2022—$75.0
6.02% Series Due 2023$75.075.0
3.69% Series Due 202460.060.0
4.90% Series Due 202530.030.0
5.10% Series Due 202530.030.0
3.20% Series Due 202675.075.0
5.99% Series Due 202760.060.0
3.30% Series Due 202840.040.0
4.08% Series Due 202970.070.0
3.74% Series Due 202950.050.0
2.50% Series Due 203046.046.0
3.86% Series Due 203060.060.0
2.79% Series Due 2031100.0100.0
4.54% Series Due 203275.0—
5.69% Series Due 203650.050.0
6.00% Series Due 204035.035.0
5.82% Series Due 204045.045.0
4.08% Series Due 204285.085.0
4.21% Series Due 204360.060.0
4.95% Series Due 204440.040.0
5.05% Series Due 204440.040.0
4.39% Series Due 204450.050.0
4.07% Series Due 204860.060.0
4.47% Series Due 204930.030.0
3.30% Series Due 205094.094.0
Armenia Mountain Senior Secured Notes 3.26% Due 202419.329.1
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 202527.827.8
Revolving Credit Facility Variable Rate Due 202613.0145.0
Senior Unsecured Notes 2.65% Due 2025150.0150.0
Senior Unsecured Notes 3.11% Due 202780.080.0
SWL&P First Mortgage Bonds 4.15% Series Due 202815.015.0
SWL&P First Mortgage Bonds 4.14% Series Due 204812.012.0
Unsecured Term Loan Variable Rate Due 2022—110.0
Unsecured Term Loan Variable Rate Due 2023170.0—
Other Long-Term Debt, 2022 Weighted Average Rate 4.94% Due 2024 – 205182.057.5
Unamortized Debt Issuance Costs(8.3)(9.0)
Total Long-Term Debt1,920.81,977.4
Less: Due Within One Year272.6214.2
Net Long-Term Debt$1,648.2$1,763.2