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Short-Term and Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Long-term Debt [Table Text Block]
Long-Term Debt  
As of December 3120212020
Millions  
First Mortgage Bonds
4.85% Series Due 2021—$15.0
3.02% Series Due 2021—60.0
3.40% Series Due 2022$75.075.0
6.02% Series Due 202375.075.0
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 2031100.0—
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
ALLETE Clean Energy Unsecured Term Loan Variable Rate Due 2021—65.0
Armenia Mountain Senior Secured Notes 3.26% Due 202429.138.6
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 202527.827.8
Revolving Credit Facility Variable Rate Due 2025145.0—
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 2021—40.0
Unsecured Term Loan Variable Rate Due 2022110.0—
Other Long-Term Debt, 2.16% – 4.58% Due 2022 – 205157.543.0
Unamortized Debt Issuance Costs(9.0)(9.5)
Total Long-Term Debt1,977.41,796.9
Less: Due Within One Year214.2203.7
Net Long-Term Debt$1,763.2$1,593.2