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Borrowings and Other Financing Instruments Debt Repurchase (Details) - NSP-Minnesota $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Debt Disclosure [Abstract] |
Debt Instrument, Repurchased Face Amount | $ 190.0
Debt Instrument, Repurchase Amount | 122.0
Gain (Loss) on Repurchase of Debt Instrument | 63.0
Debt Repurchase [Line Items] |
Debt Instrument, Repurchased Face Amount | 190.0
Debt Instrument, Repurchase Amount | 122.0
Gain (Loss) on Repurchase of Debt Instrument | 63.0
Interest Expense, Debt | $ 1.4
Series due March 1, 2050 | Bonds [Member] |
Debt Disclosure [Abstract] |
Debt Instrument, Interest Rate, Stated Percentage | 2.90%
Debt Repurchase [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 2.90%
Series Due June 1, 2051 [Domain] | Bonds [Member] |
Debt Disclosure [Abstract] |
Debt Instrument, Interest Rate, Stated Percentage | 2.60%
Debt Repurchase [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 2.60%
Series due April 1, 2052 | Bonds [Member] |
Debt Disclosure [Abstract] |
Debt Instrument, Interest Rate, Stated Percentage | 3.20%
Debt Repurchase [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 3.20%

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