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Fair value measurement - Narrative (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Transfers to/from levels	$ 0	$ 0

X

- Definition

Amount of transfers in between levels.

+ References

No definition available.

+ Details

Name:	uhg_FairValueTransferFromLevelsAmount
Namespace Prefix:	uhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration