Note 9 - Business Segments - Net Capital Expenditures (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Net capital expenditures	[1]	$ 225.1	$ 166.2
Operating Segments [Member]
Net capital expenditures	[1]	137.2	133.5
Operating Segments [Member] | JBI [Member]
Net capital expenditures	[1]	53.9	53.5
Operating Segments [Member] | DCS [Member]
Net capital expenditures	[1]	77.3	59.5
Operating Segments [Member] | ICS [Member]
Net capital expenditures	[1]	0.2	4.3
Operating Segments [Member] | FMS [Member]
Net capital expenditures	[1]	6.1	8.0
Operating Segments [Member] | JBT [Member]
Net capital expenditures	[1]	(0.3)	8.2
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Net capital expenditures	[1]	$ 87.9	$ 32.7

[1] Net capital expenditures report the additions to property and equipment, net of proceeds from the sale of property and equipment.