Employee Benefit Plans (Schedule Of Contributions To The Retirement Savings Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Retirement savings match	$ 10.5	$ 9.9	$ 9.7
Retirement benefit contribution	3.9	4.1	4.0
Total contributions	$ 14.4	$ 14.0	$ 13.7