Pension and Other Benefit Programs (Schedule of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations as of beginning of period	$ 441.7	$ 1,431.4
Defined Benefit Plan, Service Cost	4.8	5.5
Defined Benefit Plan, Interest Cost	9.0	15.5
Settlement payments	0.0	(1,006.3)
Special termination benefits	0.0	2.0
Actuarial (gain) loss	(10.9)	31.2
Benefits paid	(9.5)	(37.6)
Benefit obligations as of end of period	435.1	441.7	$ 1,431.4
Fair value of plan assets as of beginning of period	520.7	1,478.4
Actual return on plan assets	(7.4)	83.1
Employer contributions	2.9	3.1
Settlement payments	0.0	(1,006.3)
Benefits paid	(9.5)	(37.6)
Fair value of plan assets as of end of period	506.7	520.7	1,478.4
Funded status	71.6	79.0
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations as of beginning of period	81.4	77.5
Defined Benefit Plan, Service Cost	0.0	0.0	0.1
Defined Benefit Plan, Interest Cost	1.2	1.9	2.4
Plan participants' contributions	1.9	1.9
Actuarial (gain) loss	2.0	8.2
Benefits paid	(8.5)	(8.1)
Benefit obligations as of end of period	78.0	81.4	$ 77.5
Fair value of plan assets as of beginning of period	0.0
Employer contributions	6.6	6.2
Plan participants' contributions	1.9	1.9
Benefits paid	(8.5)	(8.1)
Fair value of plan assets as of end of period	0.0	0.0
Funded status	$ (78.0)	$ (81.4)