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Fair Value (Available-For-Sale Securities) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair Value Disclosure [Line Items]      
Amortized Cost $ 155.5 $ 155.5 $ 169.0
Gross Unrealized Gains 0.5 0.5 0.8
Gross Unrealized Losses (10.2) (10.2) (10.1)
Allowance for Credit Loss (0.3) (0.3) (0.6)
Fair Value 145.5 145.5 159.1
Debt Securities, Available-for-Sale, Realized Gain 0.1 0.5  
U.S. Treasury debt securities      
Fair Value Disclosure [Line Items]      
Amortized Cost 60.5 60.5 63.8
Gross Unrealized Gains 0.0 0.0 0.0
Gross Unrealized Losses (3.4) (3.4) (3.2)
Allowance for Credit Loss 0.0 0.0 0.0
Fair Value 57.1 57.1 60.6
Debt Securities, Available-for-sale, Unrealized Loss Position 57.1 57.1 58.7
Corporate/Other debt securities      
Fair Value Disclosure [Line Items]      
Amortized Cost 95.0 95.0 105.2
Gross Unrealized Gains 0.5 0.5 0.8
Gross Unrealized Losses (6.8) (6.8) (6.9)
Allowance for Credit Loss (0.3) (0.3) (0.6)
Fair Value 88.4 88.4 98.5
Debt Securities, Available-for-sale, Unrealized Loss Position $ 70.9 $ 70.9 $ 74.8