Pension and Other Benefit Programs (Schedule of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations as of beginning of period	$ 337.1	$ 435.1
Defined Benefit Plan, Service Cost	2.6	3.7
Defined Benefit Plan, Interest Cost	16.9	10.5
Actuarial loss (gain)	13.7	(99.8)
Benefits paid	(13.8)	(12.4)
Benefit obligations as of end of period	356.5	337.1	$ 435.1
Fair value of plan assets as of beginning of period	391.7	506.7
Actual return on plan assets	32.7	(105.4)
Employer contributions	2.8	2.8
Benefits paid	(13.8)	(12.4)
Fair value of plan assets as of end of period	413.4	391.7	506.7
Funded status	56.9	54.6
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations as of beginning of period	61.9	78.0
Defined Benefit Plan, Interest Cost	2.9	1.5	1.2
Plan participants' contributions	1.7	1.6
Actuarial loss (gain)	(11.6)	(12.4)
Benefits paid	(7.3)	(6.8)
Benefit obligations as of end of period	47.6	61.9	78.0
Fair value of plan assets as of beginning of period	0.0	0.0
Employer contributions	5.6	5.2
Plan participants' contributions	1.7	1.6
Benefits paid	(7.3)	(6.8)
Fair value of plan assets as of end of period	0.0	0.0	$ 0.0
Funded status	$ (47.6)	$ (61.9)