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Fair Value (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair Value Disclosure [Line Items]    
Transfers between Fair Value Hierarchies $ 0.0 $ 0.0
Allowance for Credit Loss 0.9 (0.2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0.0  
U.S. Treasury debt securities    
Fair Value Disclosure [Line Items]    
Allowance for Credit Loss 0.0 0.0
Available-for-sale securities, maturities of less than a year 5.2  
Corporate/Other debt securities    
Fair Value Disclosure [Line Items]    
Allowance for Credit Loss 0.9 $ (0.2)
Available-for-sale securities, maturities of less than a year $ 5.8