Condensed consolidated statement of comprehensive income (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2025
Condensed consolidated statement of comprehensive income [Abstract]
One-off item amount	$ 1.3	$ 0.2

The amount of one-off item of operating income that the entity does not separately disclose in the same statement or note.

No definition available.

Name:	hafn_OtherIncomeOneOffItemAmount
Namespace Prefix:	hafn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration