Subsequent Event (Details) - Subsequent events - CNML LPG Transport LLC - CNML Japanese Financing $ in Millions	Oct. 24, 2021 USD ($)
Subsequent Event
Vessel purchase price	$ 17.8
Deposit retained by buyer used for purchase payment	$ 27.9

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration