Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 2.9	$ 2.7
Building and improvements	59.3	54.5
Data processing equipment and software	41.1	41.3
Office furniture and equipment	3.4	3.9
Leasehold improvements	2.3	2.4
Total property and equipment	109.0	104.8
Less: Accumulated depreciation on property and equipment	(49.6)	(45.1)
Property, Plant and Equipment, Net, Total	$ 59.4	$ 59.7