Pension And Other Benefit Programs (Schedule Of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets as of beginning of period	$ 1,529.7
Fair value of plan assets as of end of period	1,360.4	$ 1,529.7
Defined Benefit Pension Plans [Member] | U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation as of beginning of period	1,500.1	1,522.4
Service cost	5.7	8.6
Interest cost	46.1	48.1
Partial settlement		(58.1)
Actuarial loss (gain)	(90.0)	77.2
Benefits paid	(102.2)	(103.2)
Merger of Tectum Plan		5.1
Benefit obligation as of end of period	1,359.7	1,500.1
Fair value of plan assets as of beginning of period	1,529.7	1,512.9
Actual return on plan assets	(71.0)	170.8
Employer contribution	3.9	3.9
Partial settlement		(58.1)
Benefits paid	(102.2)	(103.2)
Merger of Tectum Plan		3.4
Fair value of plan assets as of end of period	1,360.4	1,529.7
Funded status of the plans	0.7	29.6
Defined Benefit Pension Plans [Member] | Non-U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation as of beginning of period	2.7	2.5
Foreign currency translation adjustment	(0.1)	0.4
Actuarial loss (gain)		(0.1)
Benefits paid	(0.1)	(0.1)
Benefit obligation as of end of period	2.5	2.7
Employer contribution	0.1	0.1
Benefits paid	(0.1)	(0.1)
Funded status of the plans	(2.5)	(2.7)
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation as of beginning of period	86.6	93.1
Service cost	0.2	0.4
Interest cost	2.6	3.0
Plan participants' contributions	2.9	2.8
Plan amendments		(1.1)
Actuarial loss (gain)	(15.7)	(1.3)
Benefits paid	(11.2)	(10.3)
Benefit obligation as of end of period	65.4	86.6
Fair value of plan assets as of beginning of period	0.0	0.0
Employer contribution	8.3	7.5
Plan participants' contributions	2.9	2.8
Benefits paid	(11.2)	(10.3)
Fair value of plan assets as of end of period	0.0	0.0
Funded status of the plans	$ (65.4)	$ (86.6)