Pension And Other Benefit Programs (Schedule Of Effect Of One-Percentage-Point Change In Assumed Health Care Cost Trend Rates) (Details) - U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost components, Increase	$ (0.1)
Effect on total service and interest cost components, Decrease	0.1
Effect on postretirement benefit obligation, Increase	(0.8)
Effect on postretirement benefit obligation, Decrease	$ 0.7