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Assets Held For Sale - Disposal Groups, Including Discontinued Operations (Details) - Aquarion - Disposal Group, Held-for-Sale, Not Discontinued Operations
$ in Millions
Dec. 31, 2024
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Restricted Cash $ 5.8
Receivables, Net 14.4
Unbilled Revenues 11.5
Prepayments and Other Current Assets 24.6
Total Current Assets Held for Sale 56.3
Property, Plant and Equipment, Net 1,885.2
Regulatory Assets 51.2
Goodwill 662.5
Other Long-Term Assets 12.2
Total Long-Term Assets Held for Sale 2,611.1
Accounts Payable 24.2
Other Current Liabilities 28.4
Current Liabilities Held for Sale 52.6
Regulatory Liabilities 132.2
Other Long-Term Liabilities 266.7
Total Long-Term Liabilities Held for Sale $ 398.9