INVESTMENT IN SSAT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments in affiliates
Investment in Terminal Joint Venture	$ 58.7	$ 48.7
Financial information for equity method investment
Company's share of net income	56.3	26.3	$ 20.8
Distributions Received	46.9	55.4	25.2
Current assets	704.5	305.9
Non-current assets	2,988.6	2,594.7
Total Assets	3,693.1	2,900.6
Current liabilities	612.4	511.5
Non-current liabilities	1,413.3	1,427.9
Total Liabilities and Equity	$ 3,693.1	2,900.6
SSAT
Investments in affiliates
Increase in investment in SSAT		2.2
Ocean Transportation | SSAT
Investments in affiliates
Ownership interest accounted in the related party terminal joint venture (as a percent)	35.00%
Cost of services from transactions with unconsolidated affiliate	$ 284.9	251.6	218.7
Accounts payable and accrued liabilities	38.8	29.8
Financial information for equity method investment
Company's share of net income	56.3	26.3	20.8
Current assets	343.4	294.3
Non-current assets	1,239.7	1,249.5
Total Assets	1,583.1	1,543.8
Current liabilities	302.7	238.2
Non-current liabilities	1,125.5	1,179.9
Equity	154.9	125.7
Total Liabilities and Equity	1,583.1	1,543.8
Operating revenue	1,297.5	1,091.6	1,098.3
Operating costs and expenses	1,113.8	1,003.2	1,035.3
Operating Income	183.7	88.4	63.0
Net Income	$ 161.7	$ 76.6	$ 57.2