Property And Depreciation (Schedule Of Property And Depreciation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation	$ 36.1	$ 37.3	$ 38.8
Losses on impairment of assets	$ 0.3	0.3
Building
Property, Plant and Equipment [Line Items]
Estimated useful asset life	42 years
Losses on impairment of assets	$ 0.0	0.3	0.0
Furniture, Fixtures & Equipment and Software [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful asset life	3 years
Furniture, Fixtures & Equipment and Software [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful asset life	14 years
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property plant and equipment additions	$ 3.0	3.7
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Property plant and equipment additions	2.0	3.1
Capitalized Interest Costs
Property, Plant and Equipment [Line Items]
Interest costs capitalized	$ 0.2	$ 0.3	$ 0.1