CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Revenue:
Total Operating Revenue	$ 3,344.5	$ 3,421.8	$ 3,094.6
Costs and Expenses:
Operating costs	(2,583.1)	(2,565.9)	(2,470.7)
Income (Loss) from SSAT	32.5	(1.0)	2.2
General and administrative	(294.1)	(303.6)	(283.3)
Total Costs and Expenses	(2,844.7)	(2,870.5)	(2,751.8)
Operating Income	499.8	551.3	342.8
Interest income	31.7	48.3	36.0
Interest expense, net	(6.8)	(7.5)	(12.2)
Other income (expense), net	9.1	7.3	6.4
Income before Taxes	533.8	599.4	373.0
Income taxes	(89.0)	(123.0)	(75.9)
Net Income	444.8	476.4	297.1
Comprehensive Income (Loss), Net of Income Taxes:
Net Income	444.8	476.4	297.1
Other Comprehensive Income (Loss):
Net change in pension and post-retirement liabilities	5.9	3.2	(2.5)
Other adjustments	2.2	(1.5)	1.2
Total Other Comprehensive Income (Loss), Net of Income Taxes	8.1	1.7	(1.3)
Total Comprehensive Income	$ 452.9	$ 478.1	$ 295.8
Basic Earnings Per Share (in dollars per share)	$ 13.99	$ 14.14	$ 8.42
Diluted Earnings Per Share (in dollars per share)	$ 13.81	$ 13.93	$ 8.32
Weighted Average Number of Shares Outstanding:
Basic (in shares)	31.8	33.7	35.3
Diluted (in shares)	32.2	34.2	35.7
Ocean Transportation
Operating Revenue:
Total Operating Revenue	$ 2,735.5	$ 2,809.7	$ 2,477.0
Logistics
Operating Revenue:
Total Operating Revenue	$ 609.0	$ 612.1	$ 617.6