Pensions and Postretirement Benefits Other than Pensions (Components of the Company's Pension-Related Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total	$ (9.3)	$ (5.8)	$ (20.4)	$ (9.7)
Pension Costs [Member]
Service cost	18.1	17.9	36.2	35.8
Interest cost	29.8	26.9	59.6	53.9
Expected return on plan assets	(34.6)	(36.7)	(69.2)	(73.6)
Net amortization of prior service costs	1.2	1.0	2.4	2.1
Net amortization of plan net actuarial losses	13.3	12.5	26.7	25.0
Net periodic pension benefit cost	27.8	21.6	55.7	43.2
Net curtailment loss	0.0	(1.2)	(1.6)	(1.2)
Total	27.8	22.8	57.3	44.4
Pension Costs [Member] | Segment, Continuing Operations [Member]
Total
Pension Costs [Member] | Discontinued Operations [Member]
Total	3.0	2.1	6.0	4.2
Operating Income (Loss) [Member] | Pension Costs [Member] | Segment, Continuing Operations [Member]
Total	17.1	16.9	34.2	34.5
Other Nonoperating Income (Expense) [Member] | Pension Costs [Member] | Segment, Continuing Operations [Member]
Total	$ 7.7	$ 3.8	$ 17.1	$ 5.7