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Investment Activity (Lease Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Real Estate [Abstract]      
Operating lease $ 0.1 $ 0.1 $ 0.1
Future minimum lease payments, 2024 0.1    
Future minimum lease payments, 2025 0.1    
Future minimum lease payments, 2026 0.1    
Future minimum lease payments, 2027 0.1    
Future minimum lease payments, 2028 0.1    
Future minimum lease payments, thereafter 2.5    
Imputed interest $ 1.3    
Discount rate 4.70%