Pensions and Postretirement Benefits Other than Pensions (Components of the Company's Pension-Related Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total	$ (8.2)	$ (6.3)	$ (28.6)	$ (16.0)
Pension Costs [Member]
Service cost	19.0	19.0	55.2	54.8
Interest cost	29.7	27.4	89.3	81.3
Expected return on plan assets	(34.6)	(36.7)	(103.8)	(110.3)
Net amortization of prior service costs	1.2	1.1	3.6	3.2
Net amortization of plan net actuarial losses	14.0	13.8	40.7	38.8
Net periodic pension benefit cost	29.3	24.6	85.0	67.8
Net curtailment loss	(0.8)	(1.1)	(2.4)	(2.3)
Total	30.1	25.7	87.4	70.1
Pension Costs [Member] | Segment, Continuing Operations [Member]
Total
Pension Costs [Member] | Discontinued Operations [Member]
Total	3.0	2.2	9.0	6.4
Operating Income (Loss) [Member] | Pension Costs [Member] | Segment, Continuing Operations [Member]
Total	18.0	18.5	52.2	53.0
Other Nonoperating Income (Expense) [Member] | Pension Costs [Member] | Segment, Continuing Operations [Member]
Total	$ 9.1	$ 5.0	$ 26.2	$ 10.7