Pensions and Postretirement Benefits Other Than Pensions (Schedule of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net periodic benefit cost after net curtailment and settlement (gains) losses	$ (10.6)	$ (1.6)	$ (14.7)
Pension Plans [Member]
Service cost	47.5	50.9	58.3
Interest cost	70.3	58.6	83.8
Expected return on plan assets	(103.8)	(106.2)	(121.1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	3.9	5.0	5.3
Plan net actuarial losses, net amortization of	23.3	35.6	43.7
Net periodic benefit cost	41.2	43.9	70.0
Net curtailment and settlement (gains) losses	15.0	8.0	(1.8)
Net periodic benefit cost after net curtailment and settlement (gains) losses	56.2	51.9	68.2
Segment, Discontinued Operations [Member] | Pension Plans [Member]
Net periodic benefit cost after net curtailment and settlement (gains) losses	3.8	5.7	4.8
Other Nonoperating Income (Expense) [Member] | Segment, Continuing Operations [Member] | Pension Costs [Member]
Net periodic benefit cost after net curtailment and settlement (gains) losses	9.2	(0.9)	11.7
Operating Income (Loss) [Member] | Segment, Continuing Operations [Member] | Pension Plans [Member]
Net periodic benefit cost after net curtailment and settlement (gains) losses	$ 43.2	$ 47.1	$ 51.7