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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets    
Retirement Benefit Obligations $ 6.1 $ 11.2
Regulatory Assets & Liabilities 0.0 8.9
Net Operating Loss Carryforwards 2.3 0.1
Tax Credit Carryforwards 2.0 1.3
Other, net 2.5 1.3
Total Deferred Tax Assets 18.5 13.9
Deferred Tax Liabilities    
Utility Plant Differences 203.6 180.3
Regulatory Assets & Liabilities 5.6 0.0
Other, net 1.0 0.8
Total Deferred Tax Liabilities 204.6 190.0
Net Deferred Tax Liabilities $ 186.1 $ 176.1