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Litigation and Environmental - Portland (Details) - Environmental Protection Agency - Portland Harbor Superfund Site, Willamette River, Portland, Oregon $ in Billions		12 Months Ended
	Jan. 06, 2017 USD ($)	Dec. 31, 2020 Terminals Parties
GATX Terminals Corporation (n/k/a KMLT)
Accrual for Environmental Loss Contingencies, Gross | $	$ 1.1
Estimated Remedy Implementation Period	13 years
Number of Parties Involved In Site Cleanup Allocation Negotiations | Parties		90
Number of Liquid Terminals		2
KMBT
Number of Liquid Terminals		2

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