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Financing: Long-Term Debt: Aggregate Maturities of Long Term Debt and Associated Interest Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Principal Payments on Long-term Debt Including Current Maturities
Debt Instrument [Line Items]
2024	$ 600.0
2026	300.0
2027	410.0
2028	350.0
Thereafter	2,775.0
Total	4,435.0
Interest Payments on Long-term Debt
Debt Instrument [Line Items]
2024	179.0
2025	168.1
2026	162.2
2027	149.6
2028	132.9
Thereafter	1,052.2
Total	$ 1,844.0

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