Fair Value (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2026	Jun. 30, 2026	Dec. 31, 2025
Fair Value Disclosure [Line Items]
Transfers between Fair Value Hierarchies	$ 0.0	$ 0.0
Fair Value		163.3	$ 146.1
Debt Securities, Available-for-Sale, Realized Gain (Loss)		0.1
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost		7.9	7.9
Debt and Equity Securities, Unrealized Gain (Loss)	$ 0.7	1.6
Equity Securities, FV-NI		9.4	8.5
Net Assets		18.4	17.9
Net Assets		18.4	17.9
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Fair Value		10.3	9.5
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Available-for-sale Securities, Maturities, Next Twelve Months, Fair Value		10.6
Fair Value		153.0	$ 136.6
US Treasury Securities
Fair Value Disclosure [Line Items]
Fair Value		$ 5.8

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