Property and Equipment (Schedule of Property And Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Land and Land Improvements	$ 2.9	$ 2.9
Buildings and improvements	58.8	58.8
Data Processing Equipment And Software	49.2	50.0
Furniture and Fixtures, Gross	2.6	2.6
Property, Plant and Equipment, Gross	113.5	114.3
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(68.9)	(67.8)
Property and equipment, net	$ 44.6	$ 46.5