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Financing: Long-Term Debt: Aggregate Maturities of Long Term Debt and Associated Interest Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Principal Payments on Long-term Debt Including Current Maturities
Debt Instrument [Line Items]
2025	$ 0.0
2026	300.0
2027	410.0
2028	350.0
2029	400.0
Thereafter	2,825.0
Total	4,285.0
Interest Payments on Long-term Debt
Debt Instrument [Line Items]
2025	199.5
2026	189.2
2027	176.6
2028	159.9
2029	149.4
Thereafter	1,078.3
Total	$ 1,952.9

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