$JHG
Janus Henderson Group PLC Stock $jhg

$jhg Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000143774924005720 Filed on February 27, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$551.7M	$568.5M	$2.102B
YoY Change	11.27%	10.35%	-4.62%
Cost Of Revenue	$13.10M
YoY Change	-12.08%
Gross Profit	$551.7M
YoY Change	11.27%
Gross Profit Margin	100.0%
Selling, General & Admin	$199.0M	$378.2M	$1.428B
YoY Change	9.4%	6.03%	77.43%
% of Gross Profit	36.07%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.100M	$4.900M	$22.90M
YoY Change	-16.39%	-33.78%	-27.76%
% of Gross Profit	0.92%
Operating Expenses	$199.0M	$424.8M	$1.618B
YoY Change	9.4%	3.21%	101.08%
Operating Profit	$119.2M		$483.7M
YoY Change	18.73%		-1.25%
Interest Expense	$3.100M	$21.60M	$30.70M
YoY Change	0.0%	52.11%	143.65%
% of Operating Profit	2.6%		6.35%
Other Income/Expense, Net	$34.60M	$11.90M	$12.60M
YoY Change	387.32%	147.92%	9.57%
Pretax Income	$173.2M	$177.2M	$527.0M
YoY Change	41.97%	104.15%	40.38%
Income Tax	$32.60M	$32.90M	$100.3M
% Of Pretax Income	18.82%	18.57%	19.03%
Net Earnings	$130.1M	$117.8M	$380.8M
YoY Change	48.86%	87.88%	38.72%
Net Earnings / Revenue	23.58%	20.72%	18.12%
Basic Earnings Per Share	$0.81		$2.37
Diluted Earnings Per Share	$0.81	$0.74	$2.37
COMMON SHARES
Basic Shares Outstanding	161.7M	165.7M	160.4M
Diluted Shares Outstanding	157.7M		160.5M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.651B	$1.487B	$1.487B
YoY Change	-3.61%	-16.12%	-16.12%
Cash & Equivalents	$904.7M	$1.152B	$1.152B
Short-Term Investments	$728.4M	$334.2M	$334.2M
Other Short-Term Assets	$120.2M	$174.5M	$182.3M
YoY Change	3.71%	45.05%	47.13%
Inventory
Prepaid Expenses		$69.90M
Receivables	$183.4M	$94.60M	$94.60M
Other Receivables	$268.4M	$294.0M	$294.0M
Total Short-Term Assets	$2.230B	$1.487B	$1.487B
YoY Change	-2.76%	-32.88%	-32.88%
LONG-TERM ASSETS
Property, Plant & Equipment	$41.70M	$44.20M	$44.20M
YoY Change	-16.27%	-14.67%	-66.39%
Goodwill	$1.282B	$1.290B
YoY Change	0.98%	2.97%
Intangibles	$2.427B	$2.431B
YoY Change	0.19%	0.69%
Long-Term Investments	$27.40M	$29.50M	$29.50M
YoY Change		57.75%	57.75%
Other Assets	$202.4M	$1.244B	$1.244B
YoY Change	-8.17%	505.45%	506.93%
Total Long-Term Assets	$4.040B	$5.010B	$5.010B
YoY Change	-0.56%	24.53%	24.53%
TOTAL ASSETS
Total Short-Term Assets	$2.230B	$1.487B	$1.487B
Total Long-Term Assets	$4.040B	$5.010B	$5.010B
Total Assets	$6.270B	$6.497B	$6.497B
YoY Change	-1.35%	4.15%	4.15%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$211.2M	$234.6M	$118.5M
YoY Change	-5.04%	-0.97%	-1.58%
Accrued Expenses	$165.3M	$297.9M	$384.5M
YoY Change	9.33%	-0.96%	-3.03%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due		$0.00	$100.0K
YoY Change			-87.5%
Total Short-Term Liabilities	$568.4M	$631.0M	$631.0M
YoY Change	-1.39%	3.36%	3.36%
LONG-TERM LIABILITIES
Long-Term Debt	$303.9M	$304.6M	$304.6M
YoY Change	-0.95%	-0.94%	-1.39%
Other Long-Term Liabilities	$109.0M	$765.7M	$765.7M
YoY Change	14.5%	675.0%	419.82%
Total Long-Term Liabilities	$412.9M	$1.070B	$1.070B
YoY Change	2.71%	163.43%	134.61%
TOTAL LIABILITIES
Total Short-Term Liabilities	$568.4M	$631.0M	$631.0M
Total Long-Term Liabilities	$412.9M	$1.070B	$1.070B
Total Liabilities	$1.568B	$1.958B	$1.958B
YoY Change	-0.8%	19.31%	4.28%
SHAREHOLDERS EQUITY
Retained Earnings	$1.125B	$1.136B
YoY Change	3.84%	7.05%
Common Stock	$241.0M	$245.0M
YoY Change	-3.02%	-1.41%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.427B	$4.538B	$4.538B
YoY Change
Total Liabilities & Shareholders Equity	$6.270B	$6.497B	$6.497B
YoY Change	-1.35%	4.15%	4.15%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$130.1M	$117.8M	$380.8M
YoY Change	48.86%	87.88%	38.72%
Depreciation, Depletion And Amortization	$5.100M	$4.900M	$22.90M
YoY Change	-16.39%	-33.78%	-27.76%
Cash From Operating Activities	-$5.000M	$161.5M	$441.6M
YoY Change	-95.38%	10.62%	-6.7%
INVESTING ACTIVITIES
Capital Expenditures	$1.800M	$2.400M	$10.80M
YoY Change	-10.0%	-67.12%	-38.64%
Acquisitions
YoY Change
Other Investing Activities	-$52.50M	-$84.40M	-$318.1M
YoY Change	-77.48%	86.73%	-518.0%
Cash From Investing Activities	-$54.30M	-$86.80M	-$328.9M
YoY Change	-76.9%	65.33%	-662.22%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$179.2M	-76.10M	-$151.9M
YoY Change	-1398.55%	1851.28%	-63.76%
NET CHANGE
Cash From Operating Activities	-$5.000M	161.5M	$441.6M
Cash From Investing Activities	-$54.30M	-86.80M	-$328.9M
Cash From Financing Activities	-$179.2M	-76.10M	-$151.9M
Net Change In Cash	-$245.8M	-1.400M	-$8.300M
YoY Change	-21.74%	-101.56%	-114.36%
FREE CASH FLOW
Cash From Operating Activities	-$5.000M	$161.5M	$441.6M
Capital Expenditures	$1.800M	$2.400M	$10.80M
Free Cash Flow	-$6.800M	$159.1M	$430.8M
YoY Change	-93.83%	14.71%	-5.46%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.5
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.5
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	480000000
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	480000000
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	163338035
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	163338035
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	165657905
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	165657905
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	41444
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	312469
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.5
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.55
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.56
CY2022	jhg	Number Of Plans NumberOfPlans	2	pure
CY2023	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-38103
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	Y9
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-1376360
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	201 Bishopsgate
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	London
CY2023	dei	Entity Address Country EntityAddressCountry	GB
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	EC2M3AE
CY2023	dei	City Area Code CityAreaCode	20
CY2023	dei	Local Phone Number LocalPhoneNumber	7818 1818
CY2023	dei	Security12b Title Security12bTitle	Common Stock, $1.50 Per Share Par Value
CY2023	dei	Trading Symbol TradingSymbol	JHG
CY2023	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	4514177911	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	161734074
CY2023	dei	Auditor Firm AuditorFirmId	238
CY2023	dei	Auditor Name AuditorName	PricewaterhouseCoopers LLP
CY2023	dei	Auditor Location AuditorLocation	Denver, Colorado
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CY2023Q4	jhg	Fees And Other Receivables Current FeesAndOtherReceivablesCurrent	294000000	usd
CY2022Q4	jhg	Fees And Other Receivables Current FeesAndOtherReceivablesCurrent	252900000	usd
CY2023Q4	jhg	Oeic And Unit Trust Receivables OEICAndUnitTrustReceivables	94600000	usd
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CY2022Q4	us-gaap	Assets Current AssetsCurrent	2214800000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44200000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	51800000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2431300000	usd
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CY2023Q4	us-gaap	Goodwill Goodwill	1290300000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	1253100000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	87600000	usd
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CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	297900000	usd
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CY2023Q4	jhg	Oeic And Unit Trust Payable OEICAndUnitTrustPayable	98500000	usd
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CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	610500000	usd
CY2023Q4	jhg	Employee Related Liabilities Noncurrent EmployeeRelatedLiabilitiesNoncurrent	45000000	usd
CY2022Q4	jhg	Employee Related Liabilities Noncurrent EmployeeRelatedLiabilitiesNoncurrent	46900000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	304600000	usd
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CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	570800000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	574600000	usd
CY2023Q4	us-gaap	Postemployment Benefits Liability Noncurrent PostemploymentBenefitsLiabilityNoncurrent	2300000	usd
CY2022Q4	us-gaap	Postemployment Benefits Liability Noncurrent PostemploymentBenefitsLiabilityNoncurrent	3000000	usd
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CY2023Q4	us-gaap	Liabilities Liabilities	1641100000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	1641300000	usd
CY2023Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	317200000	usd
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CY2021	us-gaap	Net Income Loss NetIncomeLoss	620000000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.37
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CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.59
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.37
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.23
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.57
CY2023	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	101500000	usd
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-225100000	usd
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-50100000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	14300000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	37600000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	22400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	87200000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-262700000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-72500000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	3100000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-2000000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	84100000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-260700000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-72100000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	513900000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	11800000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	539900000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	37800000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-99900000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-8000000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	476100000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	111700000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	547900000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	426700000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	274500000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	612400000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	22900000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	31700000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	40700000	usd
CY2023	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2022	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	35800000	usd
CY2021	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	121900000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-6100000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14300000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2200000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	77400000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	90600000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	68200000	usd
CY2023	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-0	usd
CY2022	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-9100000	usd
CY2021	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-0	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	23700000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	usd
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	43400000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	-113300000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	800000	usd
CY2023	jhg	Pension Contributions In Excess Of Pension Costs Recognized PensionContributionsInExcessOfPensionCostsRecognized	3400000	usd
CY2022	jhg	Pension Contributions In Excess Of Pension Costs Recognized PensionContributionsInExcessOfPensionCostsRecognized	-900000	usd
CY2021	jhg	Pension Contributions In Excess Of Pension Costs Recognized PensionContributionsInExcessOfPensionCostsRecognized	-1200000	usd
CY2023	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	5700000	usd
CY2022	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	9100000	usd
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	8400000	usd
CY2023	jhg	Increase Decrease In Oeic And Unit Trust Receivables And Payables IncreaseDecreaseInOEICAndUnitTrustReceivablesAndPayables	3200000	usd
CY2022	jhg	Increase Decrease In Oeic And Unit Trust Receivables And Payables IncreaseDecreaseInOEICAndUnitTrustReceivablesAndPayables	700000	usd
CY2021	jhg	Increase Decrease In Oeic And Unit Trust Receivables And Payables IncreaseDecreaseInOEICAndUnitTrustReceivablesAndPayables	-1000000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	25200000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-41600000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	44500000	usd
CY2023	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-22100000	usd
CY2022	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-100100000	usd
CY2021	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	105900000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	441600000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	473300000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	895400000	usd
CY2023	jhg	Proceeds From Payments For Marketable Securities And Derivatives ProceedsFromPaymentsForMarketableSecuritiesAndDerivatives	-59700000	usd
CY2022	jhg	Proceeds From Payments For Marketable Securities And Derivatives ProceedsFromPaymentsForMarketableSecuritiesAndDerivatives	44600000	usd
CY2021	jhg	Proceeds From Payments For Marketable Securities And Derivatives ProceedsFromPaymentsForMarketableSecuritiesAndDerivatives	-177100000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10800000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17600000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10400000	usd
CY2023	jhg	Proceeds From Payments For Investment Securities By Consolidated Seeded Investment Products Net ProceedsFromPaymentsForInvestmentSecuritiesByConsolidatedSeededInvestmentProductsNet	-224900000	usd
CY2022	jhg	Proceeds From Payments For Investment Securities By Consolidated Seeded Investment Products Net ProceedsFromPaymentsForInvestmentSecuritiesByConsolidatedSeededInvestmentProductsNet	-43900000	usd
CY2021	jhg	Proceeds From Payments For Investment Securities By Consolidated Seeded Investment Products Net ProceedsFromPaymentsForInvestmentSecuritiesByConsolidatedSeededInvestmentProductsNet	-97400000	usd
CY2023	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	37500000	usd
CY2022	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	-75900000	usd
CY2021	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	27000000	usd
CY2023	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	700000	usd
CY2022	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	500000	usd
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1200000	usd
CY2023	jhg	Payments For Proceeds From Notes Receivable PaymentsForProceedsFromNotesReceivable	-3100000	usd
CY2022	jhg	Payments For Proceeds From Notes Receivable PaymentsForProceedsFromNotesReceivable	15900000	usd
CY2021	jhg	Payments For Proceeds From Notes Receivable PaymentsForProceedsFromNotesReceivable	-0	usd
CY2023	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	usd
CY2022	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	14900000	usd
CY2021	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	usd
CY2023	jhg	Proceeds From Sale Of Business Contingent Consideration ProceedsFromSaleOfBusinessContingentConsideration	200000	usd
CY2022	jhg	Proceeds From Sale Of Business Contingent Consideration ProceedsFromSaleOfBusinessContingentConsideration	0	usd
CY2021	jhg	Proceeds From Sale Of Business Contingent Consideration ProceedsFromSaleOfBusinessContingentConsideration	27400000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-328900000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	58500000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-283300000	usd
CY2023	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	3000000	usd
CY2022	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	4300000	usd
CY2021	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	12500000	usd
CY2023	jhg	Payments For Repurchase Of Common Stock For Stock Based Compensation Plans PaymentsForRepurchaseOfCommonStockForStockBasedCompensationPlans	57400000	usd
CY2022	jhg	Payments For Repurchase Of Common Stock For Stock Based Compensation Plans PaymentsForRepurchaseOfCommonStockForStockBasedCompensationPlans	113800000	usd
CY2021	jhg	Payments For Repurchase Of Common Stock For Stock Based Compensation Plans PaymentsForRepurchaseOfCommonStockForStockBasedCompensationPlans	71800000	usd
CY2023	jhg	Payments For Repurchase Of Common Stock For Stock Buyback Program PaymentsForRepurchaseOfCommonStockForStockBuybackProgram	61900000	usd
CY2022	jhg	Payments For Repurchase Of Common Stock For Stock Buyback Program PaymentsForRepurchaseOfCommonStockForStockBuybackProgram	98900000	usd
CY2021	jhg	Payments For Repurchase Of Common Stock For Stock Buyback Program PaymentsForRepurchaseOfCommonStockForStockBuybackProgram	372100000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	258700000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	259400000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	256000000	usd
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1100000	usd
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	-0	usd
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	-0	usd
CY2023	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	2600000	usd
CY2022	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	1000000	usd
CY2021	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	500000	usd
CY2023	jhg	Payments For Proceeds From Third Party Investments In Seeded Investment Products Net Of Redemptions PaymentsForProceedsFromThirdPartyInvestmentsInSeededInvestmentProductsNetOfRedemptions	-227200000	usd
CY2022	jhg	Payments For Proceeds From Third Party Investments In Seeded Investment Products Net Of Redemptions PaymentsForProceedsFromThirdPartyInvestmentsInSeededInvestmentProductsNetOfRedemptions	-51100000	usd
CY2021	jhg	Payments For Proceeds From Third Party Investments In Seeded Investment Products Net Of Redemptions PaymentsForProceedsFromThirdPartyInvestmentsInSeededInvestmentProductsNetOfRedemptions	-100300000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	400000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1400000	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	500000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-151900000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-419100000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-588100000	usd
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	30900000	usd
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-54900000	usd
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-13500000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-8300000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	57800000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	10500000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1176400000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1118600000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1108100000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1168100000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1176400000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1118600000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	14600000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	14600000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	14600000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	104300000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	140700000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	217600000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1168100000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1176400000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1118600000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4711600000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	618500000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-72100000	usd
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	256000000	usd
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	372100000	usd
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	500000	usd
CY2021	jhg	Fair Value Adjustments To Redeemable Noncontrolling Interests FairValueAdjustmentsToRedeemableNoncontrollingInterests	600000	usd
CY2021	us-gaap	Stock Granted During Period Value Sharebased Compensation Gross StockGrantedDuringPeriodValueSharebasedCompensationGross	71800000	usd
CY2021	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	0	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	68200000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	12500000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4638900000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	372400000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-260700000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	259400000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	98900000	usd
CY2022	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1000000	usd
CY2022	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	11600000	usd
CY2022	jhg	Fair Value Adjustments To Redeemable Noncontrolling Interests FairValueAdjustmentsToRedeemableNoncontrollingInterests	1400000	usd
CY2022	us-gaap	Stock Granted During Period Value Sharebased Compensation Gross StockGrantedDuringPeriodValueSharebasedCompensationGross	113800000	usd
CY2022	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	400000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	90600000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4300000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4362600000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	392000000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	84100000	usd
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	258700000	usd
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	61900000	usd
CY2023	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2600000	usd
CY2023	us-gaap	Stock Granted During Period Value Sharebased Compensation Gross StockGrantedDuringPeriodValueSharebasedCompensationGross	57400000	usd
CY2023	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-200000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	77400000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3000000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4538300000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"><b><i>Accounting Estimates</i></b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates, and the differences could be material. Our significant estimates relate to investments, goodwill and intangible assets, retirement benefit assets and obligations, and income taxes.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2023Q4	jhg	Minimum Percentage Of Ownership In Order To Qualify As Controlling Interest MinimumPercentageOfOwnershipInOrderToQualifyAsControllingInterest	0.09	pure
CY2023Q4	jhg	Minimum Percentage Of Ownership In Order To Qualify As Controlling Interest MinimumPercentageOfOwnershipInOrderToQualifyAsControllingInterest	0.09	pure
CY2023	jhg	Performance Fee Adjustment Variable Rate PerformanceFeeAdjustmentVariableRate	0.0015	pure
CY2023	jhg	Performance Fee Adjustment Measurement Period PerformanceFeeAdjustmentMeasurementPeriod	P36Y
CY2023	us-gaap	Number Of Reporting Units NumberOfReportingUnits	1	pure
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.5
CY2023Q4	jhg	Investment In Seeded Investment Products InvestmentInSeededInvestmentProducts	696500000	usd
CY2022Q4	jhg	Investment In Seeded Investment Products InvestmentInSeededInvestmentProducts	574900000	usd
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	29500000	usd
CY2022Q4	us-gaap	Equity Method Investments EquityMethodInvestments	18700000	usd
CY2023Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	746100000	usd
CY2022Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	614600000	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	43400000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	-113300000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	800000	usd
CY2023	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	2800000	usd
CY2022	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-21700000	usd
CY2021	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	41000000	usd
CY2023Q4	us-gaap	Financial Instruments Sold Not Yet Purchased Derivatives And Other Contracts FinancialInstrumentsSoldNotYetPurchasedDerivativesAndOtherContracts	1700000	usd
CY2022Q4	us-gaap	Financial Instruments Sold Not Yet Purchased Derivatives And Other Contracts FinancialInstrumentsSoldNotYetPurchasedDerivativesAndOtherContracts	500000	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	6700000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	100000	usd
CY2023	us-gaap	Depreciation Depreciation	18400000	usd
CY2022	us-gaap	Depreciation Depreciation	21600000	usd
CY2021	us-gaap	Depreciation Depreciation	23500000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	201100000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	142100000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	156900000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	90300000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44200000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	51800000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	60700000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1700000	usd
CY2023Q4	jhg	Accumulated Amortization Related To Disposals AccumulatedAmortizationRelatedToDisposals	2600000	usd
CY2023	jhg	Accumulated Amortization Related To Foreign Currency Translation Gain Loss AccumulatedAmortizationRelatedToForeignCurrencyTranslationGainLoss	2300000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	62100000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2414700000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1700000	usd
CY2023Q4	jhg	Disposal Group Including Discontinued Operation Intangible Assets Net Of Amortization DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNetOfAmortization	-0	usd
CY2023	jhg	Intangible Assets Translation Adjustments IntangibleAssetsTranslationAdjustments	18300000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2431300000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	1253100000	usd
CY2023Q4	us-gaap	Disposal Group Including Discontinued Operation Goodwill1 DisposalGroupIncludingDiscontinuedOperationGoodwill1	-0	usd
CY2023	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	37200000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	1290300000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	107200000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3700000	usd
CY2022Q4	jhg	Accumulated Amortization Related To Disposals AccumulatedAmortizationRelatedToDisposals	44700000	usd
CY2022	jhg	Accumulated Amortization Related To Foreign Currency Translation Gain Loss AccumulatedAmortizationRelatedToForeignCurrencyTranslationGainLoss	5500000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	60700000	usd
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2542700000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3700000	usd
CY2022Q4	jhg	Disposal Group Including Discontinued Operation Intangible Assets Net Of Amortization DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNetOfAmortization	44800000	usd
CY2022	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	35800000	usd
CY2022	jhg	Intangible Assets Translation Adjustments IntangibleAssetsTranslationAdjustments	-43700000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2414700000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	1341500000	usd
CY2022Q4	us-gaap	Disposal Group Including Discontinued Operation Goodwill1 DisposalGroupIncludingDiscontinuedOperationGoodwill1	7000000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	-0	usd
CY2022	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-81400000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	1253100000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6500000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	77800000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	90800000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	300000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2200000	usd
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	500000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	800000	usd
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	500000	usd
CY2023	us-gaap	Sublease Income SubleaseIncome	4300000	usd
CY2022	us-gaap	Sublease Income SubleaseIncome	5900000	usd
CY2021	us-gaap	Sublease Income SubleaseIncome	7200000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	29400000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	26900000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	27900000	usd
CY2023	jhg	Finance Lease Payments FinanceLeasePayments	400000	usd
CY2022	jhg	Finance Lease Payments FinanceLeasePayments	900000	usd
CY2021	jhg	Finance Lease Payments FinanceLeasePayments	400000	usd
CY2023	jhg	Rightofuse Asset Increase Decrease In Exchange For Operating Lease Liability RightofuseAssetIncreaseDecreaseInExchangeForOperatingLeaseLiability	2700000	usd
CY2022	jhg	Rightofuse Asset Increase Decrease In Exchange For Operating Lease Liability RightofuseAssetIncreaseDecreaseInExchangeForOperatingLeaseLiability	-3200000	usd
CY2021	jhg	Rightofuse Asset Increase Decrease In Exchange For Operating Lease Liability RightofuseAssetIncreaseDecreaseInExchangeForOperatingLeaseLiability	11400000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P51M
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P57M
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P37M
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P38M
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.025	pure
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.043	pure
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.04	pure
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.022	pure
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	24100000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	18100000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	14500000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	13400000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	10300000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1700000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	82100000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	4300000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	77800000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	18300000	usd
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	8800000	usd
CY2023	jhg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sell Off FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSellOff	0	usd
CY2022	jhg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sell Off FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSellOff	12100000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-200000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	0	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-12100000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-1200000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	200000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	300000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	4800000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	2100000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	0	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	1000000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-300000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-300000	usd
CY2023	jhg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	0	usd
CY2022	jhg	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	-300000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1100000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	18300000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	106300000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	115200000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	207500000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-6000000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14300000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2200000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	100300000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	100900000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	205300000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	527000000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	375400000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	817700000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	59800000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	57600000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	88400000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	76700000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	7000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	6300000	usd
CY2023Q4	jhg	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Debt Premium DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDebtPremium	1300000	usd
CY2022Q4	jhg	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Debt Premium DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDebtPremium	2100000	usd
CY2023Q4	jhg	Deferred Tax Asset Lease Liabilities DeferredTaxAssetLeaseLiabilities	16800000	usd
CY2022Q4	jhg	Deferred Tax Asset Lease Liabilities DeferredTaxAssetLeaseLiabilities	19600000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	13900000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	177300000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	176200000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	76800000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	68300000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	100500000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	107900000	usd
CY2023Q4	jhg	Deferred Tax Liabilities Retirement Benefits DeferredTaxLiabilitiesRetirementBenefits	21400000	usd
CY2022Q4	jhg	Deferred Tax Liabilities Retirement Benefits DeferredTaxLiabilitiesRetirementBenefits	24200000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	628600000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	631200000	usd
CY2023Q4	jhg	Deferred Tax Liabilities Lease Right Of Use Assets DeferredTaxLiabilitiesLeaseRightOfUseAssets	16200000	usd
CY2022Q4	jhg	Deferred Tax Liabilities Lease Right Of Use Assets DeferredTaxLiabilitiesLeaseRightOfUseAssets	18900000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3500000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7100000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	669700000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	681400000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	569200000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	573500000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	570800000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	574600000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	569200000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	573500000	usd
CY2023	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	6300000	usd
CY2022Q4	jhg	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	26700000	usd
CY2021Q4	jhg	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	19200000	usd
CY2020Q4	jhg	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	15800000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	6900000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9700000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	300000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1400000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1200000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4600000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	500000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	400000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	100000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-0	usd
CY2023	jhg	Unrecognized Tax Benefits Decrease Resulting From Audit Payments UnrecognizedTaxBenefitsDecreaseResultingFromAuditPayments	400000	usd
CY2022	jhg	Unrecognized Tax Benefits Decrease Resulting From Audit Payments UnrecognizedTaxBenefitsDecreaseResultingFromAuditPayments	-0	usd
CY2021	jhg	Unrecognized Tax Benefits Decrease Resulting From Audit Payments UnrecognizedTaxBenefitsDecreaseResultingFromAuditPayments	-0	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	200000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	300000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	-0	usd
CY2023Q4	jhg	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	28400000	usd
CY2022Q4	jhg	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	26700000	usd
CY2021Q4	jhg	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	19200000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	5800000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3900000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2600000	usd
CY2023	jhg	Non Cash Deferred Tax Expense Benefit NonCashDeferredTaxExpenseBenefit	-8800000	usd
CY2023Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	69900000	usd
CY2022Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	42400000	usd
CY2023Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	26500000	usd
CY2022Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	31100000	usd
CY2023Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	41500000	usd
CY2022Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	22000000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	36600000	usd
CY2022Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	24800000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	174500000	usd
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	120300000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	187600000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	205500000	usd
CY2023Q4	us-gaap	Accrued Sales Commission Current AccruedSalesCommissionCurrent	58600000	usd
CY2022Q4	us-gaap	Accrued Sales Commission Current AccruedSalesCommissionCurrent	60900000	usd
CY2023Q4	jhg	Accrued Rebates Current AccruedRebatesCurrent	17200000	usd
CY2022Q4	jhg	Accrued Rebates Current AccruedRebatesCurrent	18700000	usd
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CY2022Q4	jhg	Other Miscellaneous Accrued Liabilities Current OtherMiscellaneousAccruedLiabilitiesCurrent	72000000	usd
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CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	151600000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	11900000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	14900000	usd
CY2023Q4	jhg	Lease Liability Current LeaseLiabilityCurrent	23100000	usd
CY2022Q4	jhg	Lease Liability Current LeaseLiabilityCurrent	24500000	usd
CY2023Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	17500000	usd
CY2022Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	5100000	usd
CY2023Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	39500000	usd
CY2022Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	36500000	usd
CY2023Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	231400000	usd
CY2022Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	232600000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	22900000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	23000000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	54800000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	67100000	usd
CY2023Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	9700000	usd
CY2022Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	8700000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	87400000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	98800000	usd
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CY2021Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	148500000	usd
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	70600000	usd
CY2023	jhg	Minority Interest Period Increase Decrease Market Value Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseMarketValueOfSeededInvestmentProducts	34800000	usd
CY2022	jhg	Minority Interest Period Increase Decrease Market Value Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseMarketValueOfSeededInvestmentProducts	-97900000	usd
CY2021	jhg	Minority Interest Period Increase Decrease Market Value Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseMarketValueOfSeededInvestmentProducts	-6200000	usd
CY2023	jhg	Minority Interest Period Increase Decrease Ownership Interest Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseOwnershipInterestOfSeededInvestmentProducts	46500000	usd
CY2022	jhg	Minority Interest Period Increase Decrease Ownership Interest Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseOwnershipInterestOfSeededInvestmentProducts	184200000	usd
CY2021	jhg	Minority Interest Period Increase Decrease Ownership Interest Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseOwnershipInterestOfSeededInvestmentProducts	84300000	usd
CY2023	jhg	Minority Interest Period Increase Decrease Relating To Foreign Currency Translation Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseRelatingToForeignCurrencyTranslationOfSeededInvestmentProducts	2000000	usd
CY2022	jhg	Minority Interest Period Increase Decrease Relating To Foreign Currency Translation Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseRelatingToForeignCurrencyTranslationOfSeededInvestmentProducts	-900000	usd
CY2021	jhg	Minority Interest Period Increase Decrease Relating To Foreign Currency Translation Of Seeded Investment Products MinorityInterestPeriodIncreaseDecreaseRelatingToForeignCurrencyTranslationOfSeededInvestmentProducts	-200000	usd
CY2023Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	317200000	usd
CY2022Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	233900000	usd
CY2021Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	148500000	usd
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CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	67900000	usd
CY2023	jhg	Sharebased Award Plan Profit Interests And Other SharebasedAwardPlanProfitInterestsAndOther	700000	usd
CY2022	jhg	Sharebased Award Plan Profit Interests And Other SharebasedAwardPlanProfitInterestsAndOther	-3900000	usd
CY2021	jhg	Sharebased Award Plan Profit Interests And Other SharebasedAwardPlanProfitInterestsAndOther	2900000	usd
CY2023	jhg	Share Based Award Plan Social Security Costs ShareBasedAwardPlanSocialSecurityCosts	9500000	usd
CY2022	jhg	Share Based Award Plan Social Security Costs ShareBasedAwardPlanSocialSecurityCosts	10500000	usd
CY2021	jhg	Share Based Award Plan Social Security Costs ShareBasedAwardPlanSocialSecurityCosts	12900000	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	167400000	usd
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	180700000	usd
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	181000000	usd
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	24.83
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	83648
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	23.85
CY2023	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	201795
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	14.95
CY2022	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	193821
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	24.34
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	418292
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	29.04
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	36854
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	23.37
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	40387
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	106700000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y6M
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	6.2
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.25
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.28
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0589	pure
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0427	pure
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0368	pure
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4533	pure
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4182	pure
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4137	pure
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0347	pure
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0143	pure
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0017	pure
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y1M28D
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y2M1D
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	386584
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	19.18
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	492889
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	20.83
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1255398
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	27.13
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	137019
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	21.67
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	127903
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	22.78
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	427865
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	36.87
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	284954
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.82
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	386584
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	19.18
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	492889
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	20.83
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5954
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	8.23
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	32710
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	10.46
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	92630
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	26.62
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	284954
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	22.82
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	386584
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	19.18
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	92630
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	26.62
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2400000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1300000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	usd
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2300000	usd
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2400000	usd
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	7400000	usd
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	100000	usd
CY2022Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	500000	usd
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	1000000	usd
CY2022	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.05	pure
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8100000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8600000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8300000	usd
CY2023	jhg	Expected Rate Of Return On Plan Assets ExpectedRateOfReturnOnPlanAssets	0.044	pure
CY2023	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	-0	usd
CY2022	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	-0	usd
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	600000	usd
CY2023	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	usd
CY2022	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	usd
CY2021	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	-1100000	usd
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CY2021	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-400000	usd
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CY2023	jhg	Defined Benefit Plan Periodic Benefit Cost Credit Before Contribution To Money Purchase Section DefinedBenefitPlanPeriodicBenefitCostCreditBeforeContributionToMoneyPurchaseSection	200000	usd
CY2022	jhg	Defined Benefit Plan Periodic Benefit Cost Credit Before Contribution To Money Purchase Section DefinedBenefitPlanPeriodicBenefitCostCreditBeforeContributionToMoneyPurchaseSection	-3500000	usd
CY2021	jhg	Defined Benefit Plan Periodic Benefit Cost Credit Before Contribution To Money Purchase Section DefinedBenefitPlanPeriodicBenefitCostCreditBeforeContributionToMoneyPurchaseSection	-4600000	usd
CY2023	jhg	Defined Benefit Plan Contribution To Money Purchase Section DefinedBenefitPlanContributionToMoneyPurchaseSection	11600000	usd
CY2022	jhg	Defined Benefit Plan Contribution To Money Purchase Section DefinedBenefitPlanContributionToMoneyPurchaseSection	11500000	usd
CY2021	jhg	Defined Benefit Plan Contribution To Money Purchase Section DefinedBenefitPlanContributionToMoneyPurchaseSection	11300000	usd
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CY2022	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-15000000	usd
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CY2023	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	5900000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	87200000	usd
CY2022Q4	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-274700000	usd
CY2022Q4	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	12000000	usd
CY2022Q4	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-262700000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-73800000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	1300000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-72500000	usd
CY2023	us-gaap	Undistributed Earnings UndistributedEarnings	392000000	usd
CY2022	us-gaap	Undistributed Earnings UndistributedEarnings	372400000	usd
CY2021	us-gaap	Undistributed Earnings UndistributedEarnings	620000000	usd
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-11200000	usd
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-11300000	usd
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CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	361100000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	602300000	usd
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CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	161700000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	167900000
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	100000
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	300000
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	600000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	160500000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	162000000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	168500000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.37
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.23
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.59
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.37
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.23
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.57
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.56
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.55
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.5
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	2101800000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	2203600000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	2767000000	usd
CY2023Q4	us-gaap	Noncurrent Assets NoncurrentAssets	2475500000	usd
CY2022Q4	us-gaap	Noncurrent Assets NoncurrentAssets	2466500000	usd

Files In Submission

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$JHG
Janus Henderson Group PLC Stock $jhg

2024 Q1 Form 10-K Financial Statement

#000143774924005720 Filed on February 27, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JHG Janus Henderson Group PLC Stock $jhg

2024 Q1 Form 10-K Financial Statement

#000143774924005720 Filed on February 27, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JHG
Janus Henderson Group PLC Stock $jhg