Pension And Other Benefit Programs (Schedule Of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation as of beginning of period	$ 1,359.7	$ 1,500.1
Service cost	4.8	5.7
Interest cost	50.3	46.1
Actuarial loss (gain)	117.0	(90.0)
Benefits paid	(100.4)	(102.2)
Benefit obligation as of end of period	1,431.4	1,359.7
Fair value of plan assets as of beginning of period	1,360.4	1,529.7
Actual return on plan assets	214.4	(71.0)
Employer contributions	4.0	3.9
Benefits paid	(100.4)	(102.2)
Fair value of plan assets as of end of period	1,478.4	1,360.4
Funded status	47.0	0.7
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation as of beginning of period	65.4	86.6
Service cost	0.1	0.2
Interest cost	2.4	2.6
Plan participants' contributions	2.0	2.9
Plan amendments	(1.1)
Actuarial loss (gain)	18.1	(15.7)
Benefits paid	(9.4)	(11.2)
Benefit obligation as of end of period	77.5	65.4
Fair value of plan assets as of beginning of period	0.0	0.0
Employer contributions	7.4	8.3
Plan participants' contributions	2.0	2.9
Benefits paid	(9.4)	(11.2)
Fair value of plan assets as of end of period		0.0
Funded status	$ (77.5)	$ (65.4)