Income Taxes (Schedule Of Other Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Payroll taxes	$ 14.2	$ 13.9	$ 14.0
Property, franchise and capital stock taxes	$ 4.0	$ 4.0	$ 4.0