Pensions and Postretirement Benefits Other than Pensions (Components of the Company's Pension-Related Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Total	$ 1.2	$ (5.7)
Pension Costs [Member]
Service cost	12.0	12.8
Interest cost	17.8	14.7
Expected return on plan assets	(26.3)	(26.6)
Net amortization of prior service costs	1.0	1.3
Net amortization of plan net actuarial losses	5.9	8.9
Net periodic pension benefit cost	10.4	11.1
Net curtailment loss	0.0	(6.9)
Total	10.4	18.0
Pension Costs [Member] | Continuing Operations [Member]
Total
Pension Costs [Member] | Discontinued Operations [Member]
Total	0.9	1.0
Operating Income (Loss) [Member] | Pension Costs [Member] | Continuing Operations [Member]
Total	11.0	11.9
Other Nonoperating Income (Expense) [Member] | Pension Costs [Member] | Continuing Operations [Member]
Total	$ (1.5)	$ 5.1