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Gas And Electric Supply Contractual Obligations (Detail)
$ in Millions
Dec. 31, 2022
USD ($)
Total $ 527.1
2023 67.7
2024 48.6
2025 46.4
2026 45.5
2027 45.0
2028 & Beyond 273.9
Gas Segment [Member]  
Total 514.6
2023 66.5
2024 47.4
2025 45.2
2026 44.3
2027 43.8
2028 & Beyond 267.4
Electric [Member]  
Total 12.5
2023 1.2
2024 1.2
2025 1.2
2026 1.2
2027 1.2
2028 & Beyond $ 6.5