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Note 10 - Noncontrolling Interests - Schedule of Changes in Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Opening balance	$ 744.7	$ 346.7	$ 365.0	$ 317.2
Changes in market value	39.0	22.7	72.4	37.0
Changes in ownership	11.9	116.9	324.5	132.8
Foreign currency translation	(24.3)	7.2	9.4	6.5
Closing balance	$ 771.3	$ 493.5	$ 771.3	$ 493.5

X

- Definition

Represents the change in value of redeemable minority interest due to change in market value of seeded investment products.

+ References

No definition available.

+ Details

Name:	jhg_MinorityInterestPeriodIncreaseDecreaseMarketValueOfSeededInvestmentProducts
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in value of redeemable minority interest due to change in ownership of seeded investment products.

+ References

No definition available.

+ Details

Name:	jhg_MinorityInterestPeriodIncreaseDecreaseOwnershipInterestOfSeededInvestmentProducts
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in value of redeemable minority interest due to foreign currency translation adjustments of seeded investment products.

+ References

No definition available.

+ Details

Name:	jhg_MinorityInterestPeriodIncreaseDecreaseRelatingToForeignCurrencyTranslationOfSeededInvestmentProducts
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant