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Derivative Instrument and Hedging Activities (Fair Values of Derivative Instruments on the Balance Sheet) (Parenthetical) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Obligations secured with cash $ 27.9 $ 46.0