Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 2.7	$ 2.7
Building and improvements	54.5	33.2
Data processing equipment and software	41.3	37.3
Office furniture and equipment	3.9	3.8
Leasehold improvements	2.4	2.2
Total property and equipment	104.8	79.2
Less: Accumulated depreciation on property and equipment	(45.1)	(39.0)
Property, Plant and Equipment, Net, Total	$ 59.7	$ 40.2