Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 2.5	$ 2.5
Building and improvements	15.6	14.5
Data processing equipment and software	31.3	29.5
Office furniture and equipment	3.8	3.9
Leasehold improvements	2.2	2.0
Total property and equipment	55.4	52.4
Less: Accumulated depreciation on property and equipment	(34.9)	(34.2)
Property, Plant and Equipment, Net, Total	$ 20.5	$ 18.2