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Short-Term and Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
First Mortgage Bonds Issued August 3, 2020 [Table Text Block]
On August 3, 2020, ALLETE issued first mortgage bonds (Bonds) to certain institutional buyers in the private placement market as follows:
Maturity DatePrincipal AmountInterest Rate
August 1, 2030$46 Million2.50%
August 1, 2050$94 Million3.30%
Long-term Debt [Table Text Block]
Long-Term Debt  
As of December 3120202019
Millions  
First Mortgage Bonds
5.28% Series Due 2020—$35.0
2.80% Series Due 2020—40.0
4.85% Series Due 2021$15.015.0
3.02% Series Due 202160.060.0
3.40% Series Due 202275.075.0
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 203046.0—
3.86% Series Due 203060.060.0
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 205094.0—
Variable Demand Revenue Refunding Bonds Series 1997 A Due 2020—13.5
Unsecured Term Loan Variable Rate Due 2020—110.0
ALLETE Clean Energy Unsecured Term Loan Variable Rate Due 202165.0—
Unsecured Term Loan Variable Rate Due 202140.0—
Armenia Mountain Senior Secured Notes 3.26% Due 202438.647.8
Unsecured Senior Notes 2.65% Due 2025150.0—
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 202527.827.8
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
Other Long-Term Debt, 2.97% – 5.75% Due 2021 – 203743.046.5
Unamortized Debt Issuance Costs(9.5)(8.8)
Total Long-Term Debt1,796.91,613.8
Less: Due Within One Year203.7212.9
Net Long-Term Debt$1,593.2$1,400.9