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Other long-term liabilities - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) vessel	Dec. 31, 2017 USD ($)
Subclassifications of assets, liabilities and equities [abstract]
Undiscounted amount of estimated cash flows required to settle liabilities	$ 37.6	$ 44.9
Number of vessels delivered \| vessel	2
Total finance lease payments	$ 32.1
Interest expense on finance leases	$ 23.8