Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 2.5	$ 2.3
Building and improvements	14.5	14.6
Data processing equipment and software	29.5	28.2
Office furniture and equipment	3.9	3.9
Leasehold improvements	2.0	1.6
Total property and equipment	52.4	50.6
Less: Accumulated depreciation on property and equipment	(34.2)	(31.7)
Property, Plant and Equipment, Net, Total	$ 18.2	$ 18.9