Janus Henderson (JHG) 10-Q28 Oct 212021 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2021	Oct. 25, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-38103
Entity Registrant Name	JANUS HENDERSON GROUP PLC
Entity Incorporation, State or Country Code	Y9
Entity Tax Identification Number	98-1376360
Entity Address, Address Line One	201 Bishopsgate
Entity Address, City or Town	London
Entity Address, Country	GB
Entity Address, Postal Zip Code	EC2M3AE
Country Region	+44
City Area Code	(0) 20
Local Phone Number	7818 1818
Title of 12(b) Security	Common Stock, $1.50 Per Share Par Value
Trading Symbol	JHG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		170,584,530
Entity Central Index Key	0001274173
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Fees and other receivables	$ 359.5	$ 373.6
OEIC and unit trust receivables	180.7	114.7
Total current assets	2,299.3	2,193.7
Non-current assets:
Property, equipment and software, net	63.7	77.9
Intangible assets, net	2,620.9	2,686.3
Goodwill	1,370.8	1,383.9
Retirement benefit asset, net	189.8	191.3
Other non-current assets	158.7	157.7
Total assets	6,703.2	6,690.8
Current liabilities:
Current portion of accrued compensation, benefits and staff costs	351	371
OEIC and unit trust payables	189.6	121.5
Total current liabilities	772.9	727.8
Non-current liabilities:
Accrued compensation, benefits and staff costs	36.9	53.7
Long-term debt	311.1	313.3
Deferred tax liabilities, net	644.7	627.4
Retirement benefit obligations, net	4.7	4.7
Other non-current liabilities	125.6	144.3
Total liabilities	1,895.9	1,871.2
Commitments and contingencies (See Note 14)
REDEEMABLE NONCONTROLLING INTERESTS	145.1	85.8
EQUITY
Common stock, $1.50 par value; 480,000,000 shares authorized, and 170,584,530 and 180,403,176 shares issued and outstanding as of September 30, 2021, and December 31, 2020, respectively	255.9	270.6
Additional paid-in-capital	3,755.4	3,815
Treasury shares, X,XXX,XXX and 2,548,063 shares held at September 30, 2021, and December 31, 2020, respectively	(58.1)	(107.3)
Accumulated other comprehensive loss, net of tax	(376.9)	(324)
Retained earnings	1,070.3	1,062.1
Total shareholders' equity	4,646.6	4,716.4
Nonredeemable noncontrolling interests	15.6	17.4
Total equity	4,662.2	4,733.8
Total liabilities, redeemable noncontrolling interests and equity	6,703.2	6,690.8
Consolidated excluding VIEs
Current assets:
Cash and cash equivalents	933.1	1,099.7
Investment securities	445.2	268.1
Other current assets	122	111.1
Current liabilities:
Accounts payable and accrued liabilities	229.4	232.1
Consolidated VIEs
Current assets:
Cash and cash equivalents	11.5	8.4
Investment securities	245.3	214.6
Other current assets	2	3.5
Current liabilities:
Accounts payable and accrued liabilities	$ 2.9	$ 3.2

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)
Par value	$ 1.50	$ 1.50
Common stock, shares authorized	480,000,000	480,000,000
Common stock, shares issued	170,584,530	180,403,176
Common stock, shares outstanding	170,584,530	180,403,176
Treasury shares (in shares)	1,208,917	2,548,063

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Total revenue	$ 687.4	$ 568.5	$ 2,069.8	$ 1,641.4
Operating expenses:
Employee compensation and benefits	166.2	154.9	533.2	456.3
Long-term incentive plans	35	42.7	138.3	125.4
Distribution expenses	142.1	118.8	404.3	335.7
Investment administration	13	13.1	38.7	37.4
Marketing	7.5	5.3	20.4	15.7
General, administrative and occupancy	65.5	65.6	194.2	188.8
Impairment of goodwill and intangible assets			44.4	513.7
Depreciation and amortization	9.8	11.6	30.5	37.6
Total operating expenses	439.1	412	1,404	1,710.6
Operating income (loss)	248.3	156.5	665.8	(69.2)
Interest expense	(3.2)	(3.2)	(9.6)	(9.7)
Investment gains, net	4.7	25.5	8.1	25.3
Other non-operating income (expenses), net	3.6	(0.9)	0.8	39.9
Income (loss) before taxes	253.4	177.9	665.1	(13.7)
Income tax benefit (provision)	(53.3)	(40.8)	(176.1)	(2.1)
Net income (loss)	200.1	137.1	489	(15.8)
Net loss (income) attributable to noncontrolling interests	(3.3)	(18.2)	0.6	(9.4)
Net income (loss) attributable to JHG	$ 196.8	$ 118.9	$ 489.6	$ (25.2)
Earnings (loss) per share attributable to JHG common shareholders:
Basic	$ 1.15	$ 0.65	$ 2.82	$ (0.14)
Diluted	$ 1.14	$ 0.65	$ 2.81	$ (0.14)
Other comprehensive income (loss), net of tax:
Foreign currency translation gains (losses)	$ (59.6)	$ 97.4	$ (53.1)	$ (41.1)
Actuarial gains	0.1	0.1	0.4	0.3
Other comprehensive income (loss), net of tax	(59.5)	97.5	(52.7)	(40.8)
Other comprehensive loss (income) attributable to noncontrolling interests	0.8	(11)	(0.2)	(7.3)
Other comprehensive income (loss) attributable to JHG	(58.7)	86.5	(52.9)	(48.1)
Total comprehensive income (loss)	140.6	234.6	436.3	(56.6)
Total comprehensive loss (income) attributable to noncontrolling interests	(2.5)	(29.2)	0.4	(16.7)
Total comprehensive income (loss) attributable to JHG	138.1	205.4	436.7	(73.3)
Management fees
Revenue:
Total revenue	564.5	457.7	1,623.5	1,305
Performance fees
Revenue:
Total revenue	0.6	7	95	38.8
Shareowner servicing fees
Revenue:
Total revenue	67.6	53.7	192.4	151.3
Other revenue
Revenue:
Total revenue	$ 54.7	$ 50.1	$ 158.9	$ 146.3

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income (loss)	$ 489	$ (15.8)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	30.5	37.6
Impairment of goodwill and intangible assets	44.4	513.7
Deferred income taxes	24.2	(109.8)
Stock-based compensation plan expense	50.7	52.2
Impairment of right-of-use operating asset		1.3
Gain on sale of Geneva		(16.2)
Investment (gains) losses, net	(8.1)	(25.3)
Contributions to pension plans in excess of costs recognized	(1)	(0.4)
Contingent consideration fair value adjustment		(7.1)
Other, net	(7.4)	(14.7)
Changes in operating assets and liabilities:
OEIC and unit trust receivables and payables	2.1	8.5
Other assets	(14)	54.9
Other accruals and liabilities	3.8	(53.4)
Net operating activities	614.2	425.5
Sales (purchases) of:
Investment securities, net	(196.5)	48.8
Property, equipment and software	(5.9)	(16.5)
Investment securities by consolidated seeded investment products, net	(58)	(64.8)
Cash received (paid) on settled seed capital hedges, net	(12.6)	(0.1)
Dividends received from equity-method investments	1.1	0.4
Receipt of contingent consideration payments from sale of Volantis	0.7	2.2
Receipt of contingent consideration payments from sale of Geneva	5.4	1.6
Proceeds from sale of Geneva		38.4
Net investing activities	(265.8)	10
Financing activities:
Proceeds from stock-based compensation plans	10.9	(0.1)
Purchase of common stock for stock-based compensation plans	(72.1)	(48.4)
Purchase of common stock from Dai-ichi Life and share buyback program	(305.2)	(103.4)
Dividends paid to shareholders	(191.5)	(198.1)
Payment of contingent consideration		(13.8)
Distributions to noncontrolling interests	(0.4)	(0.5)
Third-party sales in consolidated seeded investment products, net	61.2	64.8
Principal payments under capital lease obligations	(0.3)	(0.3)
Net financing activities	(497.4)	(299.8)
Cash and cash equivalents:
Effect of foreign exchange rate changes	(14.5)	(5.7)
Net change	(163.5)	130
At beginning of period	1,108.1	796.5
At end of period	944.6	926.5
Supplemental cash flow information:
Cash paid for interest	14.6	14.6
Cash paid for income taxes, net of refunds	169.2	130.6
Reconciliation of cash and cash equivalents:
Cash and cash equivalents	944.6	926.5
Consolidated VIEs
Cash and cash equivalents:
At end of period	11.5	17.5
Reconciliation of cash and cash equivalents:
Cash and cash equivalents	11.5	17.5
Consolidated excluding VIEs
Cash and cash equivalents:
At end of period	933.1	909
Reconciliation of cash and cash equivalents:
Cash and cash equivalents	$ 933.1	$ 909

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Common stock	Additional paid-in-capital	Treasury shares	Accumulated other comprehensive loss	Retained earnings	Nonredeemable noncontrolling interests	Total
Balance at Dec. 31, 2019	$ 280.5	$ 3,828.5	$ (139.5)	$ (367.1)	$ 1,284.1	$ 19.7	$ 4,906.2
Balance (in shares) at Dec. 31, 2019	187,000,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(25.2)	(1.6)	(26.8)
Other comprehensive income (loss)				(48.1)			(48.1)
Dividends paid to shareholders		0.1			(198.2)		(198.1)
Purchase of common stock from Dai-ichi Life and/or share buyback program	$ (8.4)				(95)		(103.4)
Purchase of common stock from Dai-ichi Life and/or share buyback program (in shares)	(5,600,000)
Distributions to noncontrolling interests						(0.5)	(0.5)
Fair value adjustments to redeemable noncontrolling interests					0.1		0.1
Purchase of common stock for stock-based compensation plans		(44.9)	(3.5)				(48.4)
Vesting of stock-based compensation plans		(31.8)	31.8
Stock-based compensation plan expense		52.2					52.2
Proceeds from stock-based compensation plans		(0.1)					(0.1)
Balance at Sep. 30, 2020	$ 272.1	3,804	(111.2)	(415.2)	965.8	17.6	4,533.1
Balance (in shares) at Sep. 30, 2020	181,400,000
Balance at Jun. 30, 2020	$ 275.8	3,792.1	(114.6)	(501.7)	959.2	18.1	4,428.9
Balance (in shares) at Jun. 30, 2020	183,900,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)					118.9	(0.5)	118.4
Other comprehensive income (loss)				86.5			86.5
Dividends paid to shareholders					(65.5)		(65.5)
Purchase of common stock from Dai-ichi Life and/or share buyback program	$ (3.7)				(46.5)		(50.2)
Purchase of common stock from Dai-ichi Life and/or share buyback program (in shares)	(2,500,000)
Fair value adjustments to redeemable noncontrolling interests					(0.3)		(0.3)
Purchase of common stock for stock-based compensation plans		(2.1)	(0.6)				(2.7)
Vesting of stock-based compensation plans		(4)	4
Stock-based compensation plan expense		18.1					18.1
Proceeds from stock-based compensation plans		(0.1)					(0.1)
Balance at Sep. 30, 2020	$ 272.1	3,804	(111.2)	(415.2)	965.8	17.6	4,533.1
Balance (in shares) at Sep. 30, 2020	181,400,000
Balance at Dec. 31, 2020	$ 270.6	3,815	(107.3)	(324)	1,062.1	17.4	$ 4,733.8
Balance (in shares) at Dec. 31, 2020	180,400,000						180,403,176
Increase (Decrease) in Stockholders' Equity
Net income (loss)					489.6	(1.4)	$ 488.2
Other comprehensive income (loss)				(52.9)			(52.9)
Dividends paid to shareholders		0.1			(191.6)		(191.5)
Purchase of common stock from Dai-ichi Life and/or share buyback program	$ (14.7)				(290.5)		(305.2)
Purchase of common stock from Dai-ichi Life and/or share buyback program (in shares)	(9,800,000)
Distributions to noncontrolling interests						(0.4)	(0.4)
Fair value adjustments to redeemable noncontrolling interests					0.7		0.7
Purchase of common stock for stock-based compensation plans		(70.9)	(1.2)				(72.1)
Vesting of stock-based compensation plans		(50.4)	50.4
Stock-based compensation plan expense		50.7					50.7
Proceeds from stock-based compensation plans		10.9					10.9
Balance at Sep. 30, 2021	$ 255.9	3,755.4	(58.1)	(376.9)	1,070.3	15.6	$ 4,662.2
Balance (in shares) at Sep. 30, 2021	170,600,000						170,584,530
Balance at Jun. 30, 2021	$ 258.5	3,743.6	(67.6)	(318.2)	1,009.7	15.6	$ 4,641.6
Balance (in shares) at Jun. 30, 2021	172,300,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)					196.8	0.1	196.9
Other comprehensive income (loss)				(58.7)			(58.7)
Dividends paid to shareholders					(64.8)		(64.8)
Purchase of common stock from Dai-ichi Life and/or share buyback program	$ (2.6)				(72.4)		(75)
Purchase of common stock from Dai-ichi Life and/or share buyback program (in shares)	(1,700,000)
Distributions to noncontrolling interests						(0.1)	(0.1)
Fair value adjustments to redeemable noncontrolling interests					1		1
Purchase of common stock for stock-based compensation plans		0.5	(0.6)				(0.1)
Vesting of stock-based compensation plans		(10.1)	10.1
Stock-based compensation plan expense		16					16
Proceeds from stock-based compensation plans		5.4					5.4
Balance at Sep. 30, 2021	$ 255.9	$ 3,755.4	$ (58.1)	$ (376.9)	$ 1,070.3	$ 15.6	$ 4,662.2
Balance (in shares) at Sep. 30, 2021	170,600,000						170,584,530

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED)
Dividends paid (per share)	$ 0.38	$ 0.36	$ 1.12	$ 1.08

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	9 Months Ended
Basis of Presentation and Significant Accounting Policies	Sep. 30, 2021
Basis of Presentation and Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies	Note 1 — Basis of Presentation and Significant Accounting Policies Basis of Presentation In the opinion of management of Janus Henderson Group plc (“JHG,” “the Company,” “we,” “us,” “our” and similar terms), the accompanying unaudited condensed consolidated financial statements contain all normal recurring adjustments necessary to fairly state our financial position, results of operations and cash flows in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Such financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP are not required for interim reporting purposes and have been condensed or omitted pursuant to such rules and regulations. These financial statements should be read in conjunction with the annual consolidated financial statements and notes presented in our Annual Report on Form 10-K for the year ended December 31, 2020. Events subsequent to the balance sheet date have been evaluated for inclusion in the accompanying financial statements through the issuance date. Recent Accounting Pronouncements Adopted Income Taxes In December 2019, the Financial Accounting Standards Board (“FASB”) issued accounting standards update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is part of the FASB’s initiative to reduce complexity in accounting standards. The ASU eliminates certain exceptions to the general principles of ASC 740, Income Taxes, and simplifies income tax accounting in several areas. We adopted the ASU, which was effective as of January 1, 2021. The adoption of this ASU did not have a material impact on our results of operations or financial position.

Consolidation

Consolidation	9 Months Ended
Consolidation	Sep. 30, 2021
Consolidation
Consolidation	Note 2 — Consolidation Variable Interest Entities Consolidated Variable Interest Entities Our consolidated variable interest entities (“VIEs”) as of September 30, 2021, and December 31, 2020, include certain consolidated seeded investment products in which we have an investment and act as the investment manager. The assets of these VIEs are not available to us or our creditors. We may not, under any circumstances, access cash, cash equivalents or other assets held by consolidated VIEs to use in our operating activities or otherwise. In addition, the investors in these VIEs have no recourse to the credit of JHG. Unconsolidated Variable Interest Entities The following table presents the carrying value of investment securities included on our Condensed Consolidated Balance Sheets pertaining to unconsolidated VIEs (in millions): September 30, December 31, 2021 2020 Unconsolidated VIEs $ 99.8 $ 9.6 Our total exposure to unconsolidated VIEs represents the value of our economic ownership interest in the investment securities. Voting Rights Entities Consolidated Voting Rights Entities The following table presents the balances related to consolidated voting rights entities (“VREs”) that were recorded on our Condensed Consolidated Balance Sheets, including our net interest in these products (in millions): September 30, December 31, 2021 2020 Investment securities $ 179.3 $ 29.3 Cash and cash equivalents 2.3 2.8 Other current assets 0.8 0.4 Accounts payable and accrued liabilities (0.9) (0.1) Total $ 181.5 $ 32.4 Redeemable noncontrolling interests in consolidated VREs (23.5) — JHG's net interest in consolidated VREs $ 158.0 $ 32.4 The increase in consolidated VREs is primarily due to approximately $163 million of seed capital investments into certain exchange-traded funds (“ETF”) products in September 2021. Our total exposure to consolidated VREs represents the value of our economic ownership interest in these seeded investment products. Unconsolidated Voting Rights Entities The following table presents the carrying value of investment securities included on our Condensed Consolidated Balance Sheets pertaining to unconsolidated VREs (in millions): September 30, December 31, 2021 2020 Unconsolidated VREs $ 56.0 $ 63.6 Our total exposure to unconsolidated VREs represents the value of our economic ownership interest in the investment securities.

Investment Securities

Investment Securities	9 Months Ended
Investment Securities	Sep. 30, 2021
Investment Securities.
Investment Securities	Note 3 — Investment Securities Our investment securities as of September 30, 2021, and December 31, 2020, are summarized as follows (in millions): September 30, December 31, 2021 2020 Seeded investment products: Consolidated VIEs $ 245.3 $ 214.6 Consolidated VREs 179.3 29.3 Unconsolidated VIEs and VREs 155.8 73.2 Separate accounts 54.2 63.5 Pooled investment funds 0.1 0.1 Total seeded investment products 634.7 380.7 Investments related to deferred compensation plans 50.3 96.5 Other investments 5.5 5.5 Total investment securities $ 690.5 $ 482.7 Trading Securities Net unrealized gains on investment securities held as of the three and nine months ended September 30, 2021 and 2020, are summarized as follows (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Unrealized gains on investment securities held at period end $ 4.6 $ 25.5 $ 8.0 $ 34.1 Investment Gains, Net Investment gains, net on our Condensed Consolidated Statements of Comprehensive Income (Loss) included the following for the three and nine months ended September 30, 2021 and 2020 (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Seeded investment products and hedges, net $ 1.4 $ 5.2 $ 4.4 $ 11.2 Third-party ownership interests in seeded investment products 3.0 18.1 (1.1) 8.7 Long Tail Alpha equity method investment 0.2 0.4 2.1 6.1 Deferred equity plan 0.2 1.4 2.3 (1.2) Other (0.1) 0.4 0.4 0.5 Investment gains, net $ 4.7 $ 25.5 $ 8.1 $ 25.3 Cash Flows Cash flows related to investment securities for the nine months ended September 30, 2021 and 2020, are summarized as follows (in millions): Nine months ended September 30, 2021 2020 Sales, Sales, Purchases settlements Purchases settlements and and and and settlements maturities settlements maturities Investment securities by consolidated seeded investment products $ (66.9) $ 8.9 $ (69.3) $ 4.5 Investment securities (302.2) 105.7 (109.5) 158.3

Derivative Instruments

Derivative Instruments	9 Months Ended
Derivative Instruments	Sep. 30, 2021
Derivative Instruments
Derivative Instruments	Note 4 — Derivative Instruments Derivative Instruments Used to Hedge Seeded Investment Products We maintain an economic hedge program that uses derivative instruments to mitigate against market volatility of certain seeded investments by using index and commodity futures (“futures”), index swaps, total return swaps (“TRSs”) and credit default swaps. Foreign currency exposures associated with our seeded investment products are also hedged by using foreign currency forward contracts and swaps. We were party to the following derivative instruments as of September 30, 2021, and December 31, 2020 (in millions): Notional value September 30, 2021 December 31, 2020 Futures $ 373.6 $ 164.5 Credit default swaps 164.4 166.2 Total return swaps 59.6 35.6 Foreign currency forward contracts and swaps 390.3 205.0 The derivative instruments are not designated as hedges for accounting purposes. Changes in fair value of the derivatives are recognized in investment gains, net in our Condensed Consolidated Statements of Comprehensive Income (Loss). Derivative assets and liabilities are generally recognized on a gross basis and included in other current assets or accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets. The derivative assets and liabilities as of September 30, 2021, and December 31, 2020, are summarized as follows (in millions): Fair value September 30, 2021 December 31, 2020 Derivative assets $ 12.2 $ 9.1 Derivative liabilities 8.6 10.8 In addition to using derivative instruments to mitigate against market volatility of certain seeded investments, we also engage in short sales of securities to hedge seed investments. As of September 30, 2021, and December 31, 2020, the fair value of securities sold but not yet purchased was $2.9 million and $7.9 million, respectively. The cash received from the short sale and the obligation to repurchase the shares are classified in other current assets and accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets, respectively. Fair value adjustments are recognized in investment gains, net on our Condensed Consolidated Statements of Comprehensive Income (Loss). Derivative Instruments in Consolidated Seeded Investment Products Certain of our consolidated seeded investment products utilize derivative instruments to contribute to the achievement of defined investment objectives. These derivative instruments are classified within other current assets or accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets. Gains and losses on these derivative instruments are classified within investment gains, net in our Condensed Consolidated Statements of Comprehensive Income (Loss). Our consolidated seeded investment products were party to the following derivative instruments as of September 30, 2021, and December 31, 2020 (in millions): Notional value September 30, 2021 December 31, 2020 Futures $ 96.4 $ 57.0 Credit default swaps 5.5 1.5 Interest rate swaps 3.8 75.0 Options 0.3 0.5 Foreign currency forward contracts and swaps 83.3 56.1 Derivative Instruments — Used in Foreign Currency Hedging Program In January 2021, we implemented a balance sheet foreign currency hedging program (the “Program”) to take reasonable measures to minimize the effects of foreign currency remeasurement of monetary balance sheet accounts. The Program is not designed to eliminate all impacts of foreign currency risk; rather it is designed to reduce income statement volatility. The Program utilizes foreign currency forward contracts and swaps to achieve its objectives, and it is considered an economic hedge for accounting purposes. The notional value of the foreign currency forward contracts and swaps was $104.7 million at September 30, 2021. The derivative assets and liabilities are generally recognized on a gross basis and included in other current assets or accounts payable and accrued liabilities on our Condensed Consolidated Balance Sheets. The derivative assets and liabilities as of September 30, 2021, are summarized as follows (in millions): Fair value September 30, 2021 Derivative liabilities $ 1.9 Changes in fair value of the derivatives are recognized in other non-operating income (expenses), net on our Condensed Consolidated Statements of Comprehensive Income (Loss), and we recognized a loss of $0.8 million and a gain of $0.5 million during the three and nine months ended September 30, 2021, respectively. Foreign currency remeasurement is also recognized in other non-operating income (expenses), net on our Condensed Consolidated Statement of Comprehensive Income (Loss).

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2021
Fair Value Measurements
Fair Value Measurements	Note 5 — Fair Value Measurements The following table presents assets and liabilities reflected in the financial statements or disclosed in the notes to the financial statements at fair value on a recurring basis as of September 30, 2021 (in millions): Fair value measurements using: Quoted prices in active markets for identical assets Significant other Significant and liabilities observable inputs unobservable inputs (Level 1) (Level 2) (Level 3) Total Assets: Cash equivalents $ 384.5 $ — $ — $ 384.5 Investment securities: Consolidated VIEs 194.7 43.8 6.8 245.3 Other investment securities 418.6 26.6 — 445.2 Total investment securities 613.3 70.4 6.8 690.5 Seed hedge derivatives — 12.2 — 12.2 Derivatives in consolidated seeded investment products — 0.1 — 0.1 Volantis contingent consideration — — 2.0 2.0 Geneva contingent consideration — — 12.0 12.0 Total assets $ 997.8 $ 82.7 $ 20.8 $ 1,101.3 Liabilities: Derivatives in consolidated seeded investment products $ — $ 0.6 $ — $ 0.6 Derivatives used in foreign currency hedging program — 1.9 — 1.9 Securities sold, not yet purchased 2.9 — — 2.9 Seed hedge derivatives — 8.6 — 8.6 Long-term debt (1) — 336.8 — 336.8 Deferred bonuses — — 42.8 42.8 Total liabilities $ 2.9 $ 347.9 $ 42.8 $ 393.6 (1) Carried at amortized cost and disclosed at fair value. The following table presents assets and liabilities reflected in the financial statements or disclosed in the notes to the financial statements at fair value on a recurring basis as of December 31, 2020 (in millions): Fair value measurements using: Quoted prices in active markets for identical assets Significant other Significant and liabilities observable inputs unobservable inputs (Level 1) (Level 2) (Level 3) Total Assets: Cash equivalents $ 525.0 $ — $ — $ 525.0 Investment securities: Consolidated VIEs 125.7 77.7 11.2 214.6 Other investment securities 230.9 37.2 — 268.1 Total investment securities 356.6 114.9 11.2 482.7 Seed hedge derivatives — 9.1 — 9.1 Derivatives in consolidated seeded investment products — 0.9 — 0.9 Volantis contingent consideration — — 2.8 2.8 Geneva contingent consideration — — 17.4 17.4 Total assets $ 881.6 $ 124.9 $ 31.4 $ 1,037.9 Liabilities: Derivatives in consolidated seeded investment products $ — $ 0.2 $ — $ 0.2 Securities sold, not yet purchased 7.9 — — 7.9 Seed hedge derivatives — 10.8 — 10.8 Long-term debt (1) — 348.4 — 348.4 Deferred bonuses — — 65.2 65.2 Total liabilities $ 7.9 $ 359.4 $ 65.2 $ 432.5 (1) Carried at amortized cost and disclosed at fair value. Level 1 Fair Value Measurements Our Level 1 fair value measurements consist mostly of investments held by seeded investment products, investments in advised mutual funds, cash equivalents and investments related to deferred compensation plans with quoted market prices in active markets. The fair value level of consolidated investments held by seeded investment products is determined by the underlying securities of the product. The fair value level of unconsolidated investments held in seeded investment products is determined by the net asset value (“NAV”), which is considered a quoted price in an active market. Level 2 Fair Value Measurements Our Level 2 fair value measurements consist mostly of consolidated seeded investment products, derivative instruments and our long-term debt. The fair value of consolidated seeded investment products is determined by the underlying securities of the product. The fair value of our long-term debt is determined using broker quotes and recent trading activity, which are considered Level 2 inputs. Level 3 Fair Value Measurements Investment Securities As of September 30, 2021, and December 31, 2020, certain securities within consolidated VIEs were valued using significant unobservable inputs, resulting in Level 3 classification. In addition, we have an investment in a private equity vehicle where the significant valuation inputs are unobservable. Geneva Contingent Consideration On December 3, 2019, Henderson Global Investors (North America), Inc. (“HGINA”), a subsidiary of the Company, entered into an agreement to sell its 100% ownership interest in Geneva Capital Management LLC (“Geneva”) to GCM Purchaser, LLC. The sale closed on March 17, 2020. Consideration included aggregate cash consideration of $38.4 million and contingent consideration (the “Earnout”) based on future revenue. Payments under the Earnout are to be made quarterly over a five-year term, with minimum aggregate payments of $20.5 million and maximum aggregate payments of $35.0 million. During the three and nine months ended September 30, 2021, we received a $1.9 million and $5.4 million contingent consideration payment, respectively. Volantis Contingent Consideration On April 1, 2017, we completed the sale of the Volantis UK Small Cap (“Volantis”) alternative team assets. Consideration for the sale was a 10% share of the management and performance fees generated by Volantis (excluding one particular fund) for a period of three years following the sale. In addition, consideration for the sale included 50% of the first £12 million of performance fees generated by the excluded fund referenced above. As of September 30, 2021, the fund has not reached the £12 million performance fee threshold. As a result, this fee sharing arrangement will remain in effect until the performance threshold is reached. As of September 30, 2021, and December 31, 2020, the fair value of the Volantis contingent consideration was $2.0 million and $2.8 million, respectively. Deferred Bonuses Deferred bonuses represent liabilities to employees over the vesting period that will be settled by investments in our products. The significant unobservable inputs used to value the liabilities are investment designations and vesting periods. Changes in Fair Value Changes in fair value of our Level 3 assets for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Beginning of period fair value $ 26.5 $ 29.2 $ 31.4 $ 12.8 Contingent consideration from sale of Geneva — (1.4) — 18.9 Settlements (5.2) — (9.2) (2.2) Fair value adjustments (0.2) (1.6) (2.7) (3.3) Purchases of securities — 0.2 2.7 0.5 Sales of securities — — (1.1) — Foreign currency translation (0.3) 0.2 (0.3) (0.1) End of period fair value $ 20.8 $ 26.6 $ 20.8 $ 26.6 Changes in fair value of our individual Level 3 liabilities for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended September 30, 2021 2020 Deferred Deferred bonuses bonuses Beginning of period fair value $ 35.6 $ 42.9 Fair value adjustments 1.1 0.8 Vesting of deferred bonuses (0.9) (1.4) Amortization of deferred bonuses 7.9 8.1 Foreign currency translation (0.9) 1.8 End of period fair value $ 42.8 $ 52.2 Nine months ended September 30, 2021 2020 Deferred Contingent Deferred bonuses consideration bonuses Beginning of period fair value $ 65.2 $ 21.2 $ 76.6 Fair value adjustments 5.4 (7.1) (0.3) Vesting of deferred bonuses (51.6) — (48.1) Amortization of deferred bonuses 24.0 — 26.7 Unrealized gains (losses) — 0.3 — Distributions — (13.8) — Foreign currency translation (0.2) (0.6) (2.7) End of period fair value $ 42.8 $ — $ 52.2 Nonrecurring Fair Value Measurements Nonrecurring Level 3 fair value measurements include goodwill and intangible assets. We measure the fair value of goodwill and intangible assets on initial recognition using discounted cash flow (“DCF”) analysis that requires assumptions regarding projected future earnings and discount rates. Because of the significance of the unobservable inputs in the fair value measurements of these assets, such measurements are classified as Level 3.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
Goodwill and Intangible Assets	Sep. 30, 2021
Goodwill and Intangible Assets
Goodwill and Intangible Assets	Note 6 — Goodwill and Intangible Assets The following tables present movements in our intangible assets and goodwill during the nine months ended September 30, 2021 and 2020 (in millions): December 31, Foreign September 30, 2020 Amortization Disposal Impairment translation 2021 Indefinite-lived intangible assets: Investment management agreements $ 2,242.9 $ — $ — $ (40.8) $ (13.7) $ 2,188.4 Trademarks 373.2 — — (3.6) (0.1) 369.5 Definite-lived intangible assets: Client relationships 170.9 — — — (2.9) 168.0 Accumulated amortization (100.7) (5.8) — — 1.5 (105.0) Net intangible assets $ 2,686.3 $ (5.8) $ — $ (44.4) $ (15.2) $ 2,620.9 Goodwill $ 1,383.9 $ — $ — $ — $ (13.1) $ 1,370.8 December 31, Foreign September 30, 2019 Amortization Disposal Impairment translation 2020 Indefinite-lived intangible assets: Investment management agreements $ 2,490.3 $ — $ — $ (263.5) $ (12.7) $ 2,214.1 Trademarks 380.8 — — (7.7) (0.1) 373.0 Definite-lived intangible assets: Client relationships 364.7 — (79.3) (119.0) (0.3) 166.1 Accumulated amortization (147.2) (10.5) 61.4 — 0.6 (95.7) Net intangible assets $ 3,088.6 $ (10.5) $ (17.9) $ (390.2) $ (12.5) $ 2,657.5 Goodwill $ 1,504.3 $ — $ (23.5) $ (123.5) $ (15.4) $ 1,341.9 Interim Impairment Assessment During the second quarter of 2021, we performed an interim impairment assessment on a certain indefinite-lived intangible asset due to a significant decrease in assets under management (“AUM”) and unfavorable changes in the forecast on these specific assets. A DCF model was used to determine the estimated fair value of the investment management agreements. Some of the inputs used in the DCF model required significant management judgment, including the discount rate, terminal growth rate, forecasted financial results and market returns. The results of the DCF model revealed a fair value of nil and we therefore impaired the entire $40.8 million balance of the intangible asset. The impairment charge is included in the table above and recorded in goodwill and intangible asset impairment charges on the Condensed Consolidated Statements of Comprehensive Income (Loss). Perkins Trademark During the first quarter of 2021, as part of our ongoing strategic initiatives and looking globally at delivering excellent service to our clients and positioning our business for success, we completed a review of Perkins Investment Management (“Perkins”). To right-size our product portfolio and better align with the changing needs of clients, certain strategies were closed and the funds were liquidated during the second quarter of 2021. The majority of the Perkins value equity strategies were unaffected by this reorganization and they have continued under the Janus Henderson brand. The Perkins brand was discontinued and the marketing efforts for value equity strategies were incorporated under the Janus Henderson brand. During the first quarter 2021, we impaired the entire balance of the intangible asset associated with the Perkins trademark. The impairment charge of $3.6 million is included in the table above and recorded in goodwill and intangible asset impairment charges on the Condensed Consolidated Statements of Comprehensive Income (Loss). Sale of Geneva On December 3, 2019, HGINA, a subsidiary of JHG, entered into an agreement to sell its 100% ownership interest in Geneva to GCM Purchaser, LLC. The sale closed on March 17, 2020. The transaction included $17.9 million of net intangible assets and goodwill of $23.5 million, as disclosed in the disposal column above. 2020 Goodwill and Intangible Asset Impairments In March 2020, the World Health Organization declared COVID-19 a pandemic, and global financial markets declined. This drove a sudden and severe decline in our AUM, which was a triggering event for performing an interim impairment assessment of our goodwill and intangible assets. Our interim impairment assessment revealed the carrying value of certain investment management agreements, trademarks, client relationships and goodwill exceeded their estimated fair value, and we recognized impairments of $263.5 million, $7.7 million, $92.6 million and $123.5 million, respectively, during the three months ended March 31, 2020. The results of the March 2020 interim assessment are included in the table above. The impairment charges were recorded in goodwill and intangible asset impairment charges on the Condensed Consolidated Statements of Comprehensive Income (Loss). VelocityShares Exchange-Traded Notes In June 2020, a third-party issuer announced its intent to delist and suspend further issuances of the majority of VelocityShares exchange-traded notes (“ETNs”). The announcement was considered a triggering event for performing an interim impairment assessment of the definite-lived intangible asset. We qualitatively assessed the asset and considered how the announcement is expected to negatively impact ETN asset levels in the short and long term. While there will likely continue to be short-term revenue associated with the ETNs after they are delisted, the asset value is expected to decrease until the products become fully liquidated. As such, we impaired the entire intangible asset associated with the VelocityShares ETNs in June 2020. The impairment charge of $26.4 million is included in the table above and recorded in goodwill and intangible asset impairment charges on the Condensed Consolidated Statements of Comprehensive Income (Loss). Future Amortization Expected future amortization expense related to client relationships is summarized below (in millions): Future amortization Amount 2021 (remainder of year) $ 1.9 2022 7.6 2023 7.3 2024 5.9 2025 5.9 Thereafter 34.4 Total $ 63.0

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2021
Debt
Debt	Note 7 — Debt Our debt as of September 30, 2021, and December 31, 2020, consisted of the following (in millions): September 30, 2021 December 31, 2020 Carrying Fair Carrying Fair value value value value 4.875% Senior Notes due 2025 $ 311.1 $ 336.8 $ 313.3 $ 348.4 4.875% Senior Notes Due 2025 The 4.875% Senior Notes due 2025 (“2025 Senior Notes”) have a principal value of $300.0 million, pay interest at 4.875% semiannually on February 1 and August 1 of each year, and mature on August 1, 2025. The 2025 Senior Notes include unamortized debt premium, net at September 30, 2021, of $11.1 million, which will be amortized over the remaining life of the notes. The unamortized debt premium is recorded as a liability within long-term debt on our Condensed Consolidated Balance Sheets. JHG fully and unconditionally guarantees the obligations of Janus Capital Group Inc. (“JCG”) in relation to the 2025 Senior Notes. Credit Facility At September 30, 2021, we had a $200 million, unsecured, revolving credit facility (“Credit Facility”). JHG and its subsidiaries may use the Credit Facility for general corporate purposes. The rate of interest for each interest period is the aggregate of the applicable margin, which is based on our long-term credit rating and the London Interbank Offered Rate (“LIBOR”); the Euro Interbank Offered Rate (“EURIBOR”) in relation to any loan in euro (“EUR”); or in relation to any loan in Australian dollar (“AUD”), the benchmark rate for that currency. As LIBOR is scheduled to be phased out at the end of 2021, we are working with our banking syndicate to find a suitable replacement. We are required to pay a quarterly commitment fee on any unused portion of the Credit Facility, which is also based on our long-term credit rating. Under the Credit Facility, our financing leverage ratio cannot exceed 3.00x EBITDA. At September 30, 2021, we were in compliance with all covenants contained in, and there were no outstanding borrowings under, the Credit Facility. The maturity date of the Credit Facility is February 16, 2024.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2021
Income Taxes
Income Taxes	Note 8 — Income Taxes Our effective tax rates for the three and nine months ended September 30, 2021 and 2020, were as follows: Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Effective tax rate 21.0 % 22.9 % 26.5 % (15.3) % The change in the three months ended September 30, 2020 and the three months ended September 30, 2021 is primarily related to the enactment of Finance Act 2020, where the United Kingdom (“UK”) government announced the UK tax rate would remain at 19% and not reduce to 17% as scheduled, resulting in a deferred tax expense in the three months ended September 30, 2020. The effective tax rate for the nine months ended September 30, 2021, compared to the nine months ended September 30, 2020, was impacted by the enactment of Finance Act 2021 during the second quarter of 2021, which increased the UK corporation tax rate from 19% to 25% beginning in April 2023. As a result, the UK deferred tax assets and liabilities expected to be settled after 2023 were revalued from 19% to 25%, creating a non-cash deferred tax expense of $31.0 million. The effective tax rate for the nine months ended September 30, 2020, was also impacted by the enactment of Finance Act 2020, as discussed above. In addition, there were significant impairments of intangible assets and goodwill in the first quarter of 2020, which contributed to a pre-tax book loss for the nine months ended September 30, 2020. The majority of the impairment charges were related to temporary differences, which adjusted deferred income taxes and did not have a direct impact on the effective tax rate. As of September 30, 2021, and December 31, 2020, we had $14.9 million and $15.8 million of unrecognized tax benefits held for uncertain tax positions, respectively. We estimate that the existing liability for uncertain tax positions could decrease by up to $0.6 million within the next 12 months, without giving effect to changes in foreign currency translation.

Noncontrolling Interests

Noncontrolling Interests	9 Months Ended
Noncontrolling Interests	Sep. 30, 2021
Noncontrolling Interests
Noncontrolling Interests	Note 9 — Noncontrolling Interests Redeemable Noncontrolling Interests Redeemable noncontrolling interests as of September 30, 2021, and December 31, 2020, consisted of the following (in millions): September 30, December 31, 2021 2020 Consolidated seeded investment products $ 130.2 $ 70.6 Intech: Employee appreciation rights 12.7 12.3 Founding member ownership interests 2.2 2.9 Total redeemable noncontrolling interests $ 145.1 $ 85.8 Consolidated Seeded Investment Products Noncontrolling interests in consolidated seeded investment products are classified as redeemable noncontrolling interests when there is an obligation to repurchase units at the investor’s request. Redeemable noncontrolling interests in consolidated seeded investment products may fluctuate from period to period and are impacted by changes in our relative ownership, changes in the amount of third-party investment in seeded products and volatility in the market value of the underlying securities included in the portfolios of seeded products. Redemptions of investments by third parties in any particular seeded product are redeemed from the net assets of such seeded product and cannot be redeemed from the assets of our other seeded products or from our other assets. The following table presents the movement in redeemable noncontrolling interests in consolidated seeded investment products for the three and nine months ended September 30, 2021 and 2020 (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Opening balance $ 109.2 $ 453.7 $ 70.6 $ 662.8 Changes in market value 3.0 18.8 0.6 10.9 Changes in ownership 18.4 (413.1) 58.5 (610.0) Foreign currency translation (0.4) 11.4 0.5 7.1 Closing balance $ 130.2 $ 70.8 $ 130.2 $ 70.8 Intech Intech Investment Management LLC (“Intech”) ownership interests held by a founding member had an estimated fair value of $2.2 million as of September 30, 2021, representing an approximate 1.1% ownership of Intech. This founding member is entitled to retain his remaining Intech interests for the remainder of his life and has the option to require us to purchase his ownership interests in Intech at fair value. Intech employee appreciation rights are amortized using a graded vesting method over the respective vesting period. The appreciation rights are exercisable upon termination of employment from Intech to the extent vested. Upon exercise, the appreciation rights are settled in Intech equity. Nonredeemable Noncontrolling Interests Nonredeemable noncontrolling interests as of September 30, 2021, and December 31, 2020, were as follows (in millions): September 30, December 31, 2021 2020 Nonredeemable noncontrolling interests in: Seed capital investments $ 2.9 $ 4.6 Intech 12.7 12.8 Total nonredeemable noncontrolling interests $ 15.6 $ 17.4

Long-Term Incentive Compensatio

Long-Term Incentive Compensation	9 Months Ended
Long-Term Incentive Compensation	Sep. 30, 2021
Long-Term Incentive Compensation
Long-Term Incentive Compensation	Note 10 — Long-Term Incentive and Employee Compensation The following table presents restricted stock and mutual fund awards granted during the three and nine months ended September 30, 2021 (in millions): Three months ended Nine months ended September 30, September 30, 2021 2021 Restricted stock $ 1.0 $ 69.5 Mutual fund awards 0.1 75.5 Total $ 1.1 $ 145.0 Restricted stock and mutual fund awards generally vest and will be recognized using a graded vesting method over a three

Retirement Benefit Plans

Retirement Benefit Plans	9 Months Ended
Retirement Benefit Plans	Sep. 30, 2021
Retirement Benefit Plans
Retirement Benefit Plans	Note 11 — Retirement Benefit Plans We operate defined contribution retirement benefit plans and defined benefit pension plans. Our primary defined benefit pension plan is the defined benefit section of the Janus Henderson Group UK Pension Scheme (“JHGPS”). Net Periodic Benefit Credit The components of net periodic benefit credit in respect of defined benefit plans for the three and nine months ended September 30, 2021 and 2020, include the following (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Service cost $ (0.2) $ (0.2) $ (0.7) $ (0.6) Interest cost (2.8) (4.3) (8.4) (12.9) Amortization of prior service cost (0.1) (0.1) (0.3) (0.3) Expected return on plan assets 3.3 4.7 10.0 13.9 Net periodic benefit credit $ 0.2 $ 0.1 $ 0.6 $ 0.1 Total cost

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
Accumulated Other Comprehensive Loss	Sep. 30, 2021
Accumulated Other Comprehensive Loss.
Accumulated Other Comprehensive Loss	Note 12 — Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss, net of tax for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended September 30, 2021 2020 Foreign Retirement benefit Foreign Retirement currency asset, net Total currency asset, net Total Beginning balance $ (308.1) $ (10.1) $ (318.2) $ (521.0) $ 19.3 $ (501.7) Other comprehensive income (loss) (59.6) — (59.6) 97.6 (0.2) 97.4 Amounts reclassified from accumulated other comprehensive loss — 0.1 0.1 (0.2) 0.3 0.1 Total other comprehensive income (loss) (59.6) 0.1 (59.5) 97.4 0.1 97.5 Less: other comprehensive loss (income) attributable to noncontrolling interests 0.8 — 0.8 (11.0) — (11.0) Ending balance $ (366.9) $ (10.0) $ (376.9) $ (434.6) $ 19.4 $ (415.2) Nine months ended September 30, 2021 2020 Foreign Retirement benefit Foreign Retirement currency asset, net Total currency asset, net Total Beginning balance $ (313.6) $ (10.4) $ (324.0) $ (386.2) $ 19.1 $ (367.1) Other comprehensive income (loss) (48.9) 0.1 (48.8) (39.5) — (39.5) Amounts reclassified from accumulated other comprehensive loss (4.2) 0.3 (3.9) (1.6) 0.3 (1.3) Total other comprehensive income (loss) (53.1) 0.4 (52.7) (41.1) 0.3 (40.8) Less: other comprehensive loss (income) attributable to noncontrolling interests (0.2) — (0.2) (7.3) — (7.3) Ending balance $ (366.9) $ (10.0) $ (376.9) $ (434.6) $ 19.4 $ (415.2) The components of other comprehensive income (loss), net of tax for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended September 30, 2021 2020 Pre-tax Tax Net Pre-tax Tax Net amount impact amount amount impact amount Foreign currency translation adjustments $ (60.2) $ 0.6 $ (59.6) $ 98.2 $ (0.6) $ 97.6 Retirement benefit asset, net — — — (0.2) — (0.2) Reclassifications to net income 0.1 — 0.1 0.1 — 0.1 Total other comprehensive income (loss) $ (60.1) $ 0.6 $ (59.5) $ 98.1 $ (0.6) $ 97.5 Nine months ended September 30, 2021 2020 Pre-tax Tax Net Pre-tax Tax Net amount impact Amount amount impact Amount Foreign currency translation adjustments $ (50.5) $ 1.6 $ (48.9) $ (41.0) $ 1.5 $ (39.5) Retirement benefit asset, net — 0.1 0.1 — — — Reclassifications to net income (3.9) — (3.9) (1.3) — (1.3) Total other comprehensive income (loss) $ (54.4) $ 1.7 $ (52.7) $ (42.3) $ 1.5 $ (40.8)

Earnings and Dividends Per Shar

Earnings and Dividends Per Share	9 Months Ended
Earnings and Dividends Per Share	Sep. 30, 2021
Earnings and Dividends Per Share
Earnings (Loss) and Dividends Per Share	Note 13 — Earnings (Loss) and Dividends Per Share Earnings (Loss) Per Share The following is a summary of the earnings (loss) per share calculation for the three and nine months ended September 30, 2021 and 2020 (in millions, except per share data): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Net income (loss) attributable to JHG $ 196.8 $ 118.9 $ 489.6 $ (25.2) Allocation of earnings to participating stock-based awards (5.4) (3.5) (14.1) — Net income (loss) attributable to JHG common shareholders $ 191.4 $ 115.4 $ 475.5 $ (25.2) Weighted-average common shares outstanding — basic 167.1 178.4 168.7 180.4 Dilutive effect of nonparticipating stock-based awards 0.7 0.4 0.7 — Weighted-average common shares outstanding — diluted 167.8 178.8 169.4 180.4 Earnings (loss) per share: Basic (two class) $ 1.15 $ 0.65 $ 2.82 $ (0.14) Diluted (two class) $ 1.14 $ 0.65 $ 2.81 $ (0.14) The following instruments are anti-dilutive and have not been included in the weighted-average diluted shares outstanding calculation (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Unvested nonparticipating stock awards 0.3 0.8 0.5 1.5 Dividends Per Share The payment of cash dividends is within the discretion of our Board of Directors and depends on many factors, including, but not limited to, our results of operations, financial condition, capital requirements, legal requirements and general business conditions. The following is a summary of cash dividends paid during the nine months ended September 30, 2021: Dividend Date Dividends paid Date per share declared (in US$ millions) paid $ 0.36 February 3, 2021 $ 61.7 March 3, 2021 $ 0.38 April 28, 2021 $ 65.0 May 27, 2021 $ 0.38 July 28, 2021 $ 64.8 August 25, 2021 On October 27, 2021, our Board of Directors declared a cash dividend of $0.38 per share. The quarterly dividend will be paid on November 24, 2021, to shareholders of record at the close of business on November 8, 2021.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2021
Commitments and Contingencies
Commitments and Contingencies	Note 14 — Commitments and Contingencies Related Party Transactions On February 4, 2021, Dai-ichi Life Holdings, Inc. (“Dai-ichi Life”) announced its intention to sell all 30,668,922 shares of JHG common stock it owned by means of a registered secondary public offering. On February 9, 2021, Dai-ichi Life completed the secondary offering, and as part of the offering, we repurchased 8,048,360 shares of common stock from Dai-ichi Life for approximately $230.0 million through Goldman Sachs & Co. LLC (“as underwriter”) at the price at which the shares of common stock were sold to the public in the secondary offering, less the underwriting discount. As a result of the completion of the secondary offering, Dai-ichi Life no longer owns any shares of JHG common stock. We did not receive any proceeds from Dai-ichi Life’s sale of common stock in the secondary offering. Litigation and Other Regulatory Matters We are periodically involved in various legal proceedings and other regulatory matters. Although there can be no assurances, based on information currently available, we believe that it is probable that the ultimate outcome of matters that are pending or threatened will not have a material effect on our consolidated financial statements.

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Basis of Presentation and Significant Accounting Policies
Basis of Presentation	Basis of Presentation In the opinion of management of Janus Henderson Group plc (“JHG,” “the Company,” “we,” “us,” “our” and similar terms), the accompanying unaudited condensed consolidated financial statements contain all normal recurring adjustments necessary to fairly state our financial position, results of operations and cash flows in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Such financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP are not required for interim reporting purposes and have been condensed or omitted pursuant to such rules and regulations. These financial statements should be read in conjunction with the annual consolidated financial statements and notes presented in our Annual Report on Form 10-K for the year ended December 31, 2020. Events subsequent to the balance sheet date have been evaluated for inclusion in the accompanying financial statements through the issuance date.
Recent Accounting Pronouncements Adopted	Recent Accounting Pronouncements Adopted Income Taxes In December 2019, the Financial Accounting Standards Board (“FASB”) issued accounting standards update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is part of the FASB’s initiative to reduce complexity in accounting standards. The ASU eliminates certain exceptions to the general principles of ASC 740, Income Taxes, and simplifies income tax accounting in several areas. We adopted the ASU, which was effective as of January 1, 2021. The adoption of this ASU did not have a material impact on our results of operations or financial position.

Consolidation (Tables)

Consolidation (Tables)	9 Months Ended
Consolidation (Tables)	Sep. 30, 2021
Consolidation
Schedule of unconsolidated variable interest entities (VIEs)	The following table presents the carrying value of investment securities included on our Condensed Consolidated Balance Sheets pertaining to unconsolidated VIEs (in millions): September 30, December 31, 2021 2020 Unconsolidated VIEs $ 99.8 $ 9.6
Schedule of consolidated voting right entities (VREs)	The following table presents the balances related to consolidated voting rights entities (“VREs”) that were recorded on our Condensed Consolidated Balance Sheets, including our net interest in these products (in millions): September 30, December 31, 2021 2020 Investment securities $ 179.3 $ 29.3 Cash and cash equivalents 2.3 2.8 Other current assets 0.8 0.4 Accounts payable and accrued liabilities (0.9) (0.1) Total $ 181.5 $ 32.4 Redeemable noncontrolling interests in consolidated VREs (23.5) — JHG's net interest in consolidated VREs $ 158.0 $ 32.4
Schedule of unconsolidated voting right entities (VREs)	The following table presents the carrying value of investment securities included on our Condensed Consolidated Balance Sheets pertaining to unconsolidated VREs (in millions): September 30, December 31, 2021 2020 Unconsolidated VREs $ 56.0 $ 63.6

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
Investment Securities (Tables)	Sep. 30, 2021
Investment Securities.
Summary of investment securities	Our investment securities as of September 30, 2021, and December 31, 2020, are summarized as follows (in millions): September 30, December 31, 2021 2020 Seeded investment products: Consolidated VIEs $ 245.3 $ 214.6 Consolidated VREs 179.3 29.3 Unconsolidated VIEs and VREs 155.8 73.2 Separate accounts 54.2 63.5 Pooled investment funds 0.1 0.1 Total seeded investment products 634.7 380.7 Investments related to deferred compensation plans 50.3 96.5 Other investments 5.5 5.5 Total investment securities $ 690.5 $ 482.7
Schedule of net unrealized gains on trading securities	Net unrealized gains on investment securities held as of the three and nine months ended September 30, 2021 and 2020, are summarized as follows (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Unrealized gains on investment securities held at period end $ 4.6 $ 25.5 $ 8.0 $ 34.1
Schedule of investment gains (losses), net in Consolidated Statements of Comprehensive Income	Investment gains, net on our Condensed Consolidated Statements of Comprehensive Income (Loss) included the following for the three and nine months ended September 30, 2021 and 2020 (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Seeded investment products and hedges, net $ 1.4 $ 5.2 $ 4.4 $ 11.2 Third-party ownership interests in seeded investment products 3.0 18.1 (1.1) 8.7 Long Tail Alpha equity method investment 0.2 0.4 2.1 6.1 Deferred equity plan 0.2 1.4 2.3 (1.2) Other (0.1) 0.4 0.4 0.5 Investment gains, net $ 4.7 $ 25.5 $ 8.1 $ 25.3
Cash flows related to investment securities	Cash flows related to investment securities for the nine months ended September 30, 2021 and 2020, are summarized as follows (in millions): Nine months ended September 30, 2021 2020 Sales, Sales, Purchases settlements Purchases settlements and and and and settlements maturities settlements maturities Investment securities by consolidated seeded investment products $ (66.9) $ 8.9 $ (69.3) $ 4.5 Investment securities (302.2) 105.7 (109.5) 158.3

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
Derivative Instruments (Tables)	Sep. 30, 2021
Seeded investment products
Schedule of derivative instruments	Our consolidated seeded investment products were party to the following derivative instruments as of September 30, 2021, and December 31, 2020 (in millions): Notional value September 30, 2021 December 31, 2020 Futures $ 96.4 $ 57.0 Credit default swaps 5.5 1.5 Interest rate swaps 3.8 75.0 Options 0.3 0.5 Foreign currency forward contracts and swaps 83.3 56.1
Forward foreign exchange contracts and swaps
Schedule of Derivative assets and liabilities	Fair value September 30, 2021 Derivative liabilities $ 1.9
Not Designated as Hedging Instrument
Schedule of derivative instruments	We were party to the following derivative instruments as of September 30, 2021, and December 31, 2020 (in millions): Notional value September 30, 2021 December 31, 2020 Futures $ 373.6 $ 164.5 Credit default swaps 164.4 166.2 Total return swaps 59.6 35.6 Foreign currency forward contracts and swaps 390.3 205.0
Not Designated as Hedging Instrument
Schedule of Derivative assets and liabilities	Fair value September 30, 2021 December 31, 2020 Derivative assets $ 12.2 $ 9.1 Derivative liabilities 8.6 10.8

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2021
Fair Value Measurements
Schedule of assets and liabilities presented in the financial statements or disclosed in the notes to the financial statements at fair value on a recurring basis	The following table presents assets and liabilities reflected in the financial statements or disclosed in the notes to the financial statements at fair value on a recurring basis as of September 30, 2021 (in millions): Fair value measurements using: Quoted prices in active markets for identical assets Significant other Significant and liabilities observable inputs unobservable inputs (Level 1) (Level 2) (Level 3) Total Assets: Cash equivalents $ 384.5 $ — $ — $ 384.5 Investment securities: Consolidated VIEs 194.7 43.8 6.8 245.3 Other investment securities 418.6 26.6 — 445.2 Total investment securities 613.3 70.4 6.8 690.5 Seed hedge derivatives — 12.2 — 12.2 Derivatives in consolidated seeded investment products — 0.1 — 0.1 Volantis contingent consideration — — 2.0 2.0 Geneva contingent consideration — — 12.0 12.0 Total assets $ 997.8 $ 82.7 $ 20.8 $ 1,101.3 Liabilities: Derivatives in consolidated seeded investment products $ — $ 0.6 $ — $ 0.6 Derivatives used in foreign currency hedging program — 1.9 — 1.9 Securities sold, not yet purchased 2.9 — — 2.9 Seed hedge derivatives — 8.6 — 8.6 Long-term debt (1) — 336.8 — 336.8 Deferred bonuses — — 42.8 42.8 Total liabilities $ 2.9 $ 347.9 $ 42.8 $ 393.6 (1) Carried at amortized cost and disclosed at fair value. The following table presents assets and liabilities reflected in the financial statements or disclosed in the notes to the financial statements at fair value on a recurring basis as of December 31, 2020 (in millions): Fair value measurements using: Quoted prices in active markets for identical assets Significant other Significant and liabilities observable inputs unobservable inputs (Level 1) (Level 2) (Level 3) Total Assets: Cash equivalents $ 525.0 $ — $ — $ 525.0 Investment securities: Consolidated VIEs 125.7 77.7 11.2 214.6 Other investment securities 230.9 37.2 — 268.1 Total investment securities 356.6 114.9 11.2 482.7 Seed hedge derivatives — 9.1 — 9.1 Derivatives in consolidated seeded investment products — 0.9 — 0.9 Volantis contingent consideration — — 2.8 2.8 Geneva contingent consideration — — 17.4 17.4 Total assets $ 881.6 $ 124.9 $ 31.4 $ 1,037.9 Liabilities: Derivatives in consolidated seeded investment products $ — $ 0.2 $ — $ 0.2 Securities sold, not yet purchased 7.9 — — 7.9 Seed hedge derivatives — 10.8 — 10.8 Long-term debt (1) — 348.4 — 348.4 Deferred bonuses — — 65.2 65.2 Total liabilities $ 7.9 $ 359.4 $ 65.2 $ 432.5 (1) Carried at amortized cost and disclosed at fair value.
Schedule of changes in fair value of the recurring Level 3 fair value measurements for collective items	Changes in fair value of our Level 3 assets for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Beginning of period fair value $ 26.5 $ 29.2 $ 31.4 $ 12.8 Contingent consideration from sale of Geneva — (1.4) — 18.9 Settlements (5.2) — (9.2) (2.2) Fair value adjustments (0.2) (1.6) (2.7) (3.3) Purchases of securities — 0.2 2.7 0.5 Sales of securities — — (1.1) — Foreign currency translation (0.3) 0.2 (0.3) (0.1) End of period fair value $ 20.8 $ 26.6 $ 20.8 $ 26.6
Schedule of changes in fair value of the recurring Level 3 fair value measurements for individual items	Changes in fair value of our individual Level 3 liabilities for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended September 30, 2021 2020 Deferred Deferred bonuses bonuses Beginning of period fair value $ 35.6 $ 42.9 Fair value adjustments 1.1 0.8 Vesting of deferred bonuses (0.9) (1.4) Amortization of deferred bonuses 7.9 8.1 Foreign currency translation (0.9) 1.8 End of period fair value $ 42.8 $ 52.2 Nine months ended September 30, 2021 2020 Deferred Contingent Deferred bonuses consideration bonuses Beginning of period fair value $ 65.2 $ 21.2 $ 76.6 Fair value adjustments 5.4 (7.1) (0.3) Vesting of deferred bonuses (51.6) — (48.1) Amortization of deferred bonuses 24.0 — 26.7 Unrealized gains (losses) — 0.3 — Distributions — (13.8) — Foreign currency translation (0.2) (0.6) (2.7) End of period fair value $ 42.8 $ — $ 52.2

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
Goodwill and Intangible Assets (Tables)	Sep. 30, 2021
Goodwill and Intangible Assets
Summary of goodwill and intangible assets	The following tables present movements in our intangible assets and goodwill during the nine months ended September 30, 2021 and 2020 (in millions): December 31, Foreign September 30, 2020 Amortization Disposal Impairment translation 2021 Indefinite-lived intangible assets: Investment management agreements $ 2,242.9 $ — $ — $ (40.8) $ (13.7) $ 2,188.4 Trademarks 373.2 — — (3.6) (0.1) 369.5 Definite-lived intangible assets: Client relationships 170.9 — — — (2.9) 168.0 Accumulated amortization (100.7) (5.8) — — 1.5 (105.0) Net intangible assets $ 2,686.3 $ (5.8) $ — $ (44.4) $ (15.2) $ 2,620.9 Goodwill $ 1,383.9 $ — $ — $ — $ (13.1) $ 1,370.8 December 31, Foreign September 30, 2019 Amortization Disposal Impairment translation 2020 Indefinite-lived intangible assets: Investment management agreements $ 2,490.3 $ — $ — $ (263.5) $ (12.7) $ 2,214.1 Trademarks 380.8 — — (7.7) (0.1) 373.0 Definite-lived intangible assets: Client relationships 364.7 — (79.3) (119.0) (0.3) 166.1 Accumulated amortization (147.2) (10.5) 61.4 — 0.6 (95.7) Net intangible assets $ 3,088.6 $ (10.5) $ (17.9) $ (390.2) $ (12.5) $ 2,657.5 Goodwill $ 1,504.3 $ — $ (23.5) $ (123.5) $ (15.4) $ 1,341.9
Client relationships
Goodwill and Intangible Assets
Schedule of expected future amortization	Expected future amortization expense related to client relationships is summarized below (in millions): Future amortization Amount 2021 (remainder of year) $ 1.9 2022 7.6 2023 7.3 2024 5.9 2025 5.9 Thereafter 34.4 Total $ 63.0

Debt (Tables)

Debt (Tables)	9 Months Ended
Debt (Tables)	Sep. 30, 2021
Debt
Components of debt	Our debt as of September 30, 2021, and December 31, 2020, consisted of the following (in millions): September 30, 2021 December 31, 2020 Carrying Fair Carrying Fair value value value value 4.875% Senior Notes due 2025 $ 311.1 $ 336.8 $ 313.3 $ 348.4

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
Income Taxes (Tables)	Sep. 30, 2021
Income Taxes
Schedule of effective income tax rates	Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Effective tax rate 21.0 % 22.9 % 26.5 % (15.3) %

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	9 Months Ended
Noncontrolling Interests (Tables)	Sep. 30, 2021
Noncontrolling Interests
Summary of redeemable noncontrolling interests	Redeemable noncontrolling interests as of September 30, 2021, and December 31, 2020, consisted of the following (in millions): September 30, December 31, 2021 2020 Consolidated seeded investment products $ 130.2 $ 70.6 Intech: Employee appreciation rights 12.7 12.3 Founding member ownership interests 2.2 2.9 Total redeemable noncontrolling interests $ 145.1 $ 85.8
Schedule of movement in redeemable noncontrolling interests in consolidated seeded investment products	The following table presents the movement in redeemable noncontrolling interests in consolidated seeded investment products for the three and nine months ended September 30, 2021 and 2020 (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Opening balance $ 109.2 $ 453.7 $ 70.6 $ 662.8 Changes in market value 3.0 18.8 0.6 10.9 Changes in ownership 18.4 (413.1) 58.5 (610.0) Foreign currency translation (0.4) 11.4 0.5 7.1 Closing balance $ 130.2 $ 70.8 $ 130.2 $ 70.8
Summary of nonredeemable noncontrolling interests	Nonredeemable noncontrolling interests as of September 30, 2021, and December 31, 2020, were as follows (in millions): September 30, December 31, 2021 2020 Nonredeemable noncontrolling interests in: Seed capital investments $ 2.9 $ 4.6 Intech 12.7 12.8 Total nonredeemable noncontrolling interests $ 15.6 $ 17.4

Long-Term Incentive Compensat_2

Long-Term Incentive Compensation (Tables)	9 Months Ended
Long-Term Incentive Compensation (Tables)	Sep. 30, 2021
Long-Term Incentive Compensation
Schedule of presents restricted stock and mutual fund awards granted	The following table presents restricted stock and mutual fund awards granted during the three and nine months ended September 30, 2021 (in millions): Three months ended Nine months ended September 30, September 30, 2021 2021 Restricted stock $ 1.0 $ 69.5 Mutual fund awards 0.1 75.5 Total $ 1.1 $ 145.0

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	9 Months Ended
Retirement Benefit Plans (Tables)	Sep. 30, 2021
Retirement Benefit Plans
Schedule of components of net periodic benefit credit	The components of net periodic benefit credit in respect of defined benefit plans for the three and nine months ended September 30, 2021 and 2020, include the following (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Service cost $ (0.2) $ (0.2) $ (0.7) $ (0.6) Interest cost (2.8) (4.3) (8.4) (12.9) Amortization of prior service cost (0.1) (0.1) (0.3) (0.3) Expected return on plan assets 3.3 4.7 10.0 13.9 Net periodic benefit credit $ 0.2 $ 0.1 $ 0.6 $ 0.1 Total cost

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Sep. 30, 2021
Accumulated Other Comprehensive Loss.
Schedule of the changes in accumulated other comprehensive loss, net of tax	Changes in accumulated other comprehensive loss, net of tax for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended September 30, 2021 2020 Foreign Retirement benefit Foreign Retirement currency asset, net Total currency asset, net Total Beginning balance $ (308.1) $ (10.1) $ (318.2) $ (521.0) $ 19.3 $ (501.7) Other comprehensive income (loss) (59.6) — (59.6) 97.6 (0.2) 97.4 Amounts reclassified from accumulated other comprehensive loss — 0.1 0.1 (0.2) 0.3 0.1 Total other comprehensive income (loss) (59.6) 0.1 (59.5) 97.4 0.1 97.5 Less: other comprehensive loss (income) attributable to noncontrolling interests 0.8 — 0.8 (11.0) — (11.0) Ending balance $ (366.9) $ (10.0) $ (376.9) $ (434.6) $ 19.4 $ (415.2) Nine months ended September 30, 2021 2020 Foreign Retirement benefit Foreign Retirement currency asset, net Total currency asset, net Total Beginning balance $ (313.6) $ (10.4) $ (324.0) $ (386.2) $ 19.1 $ (367.1) Other comprehensive income (loss) (48.9) 0.1 (48.8) (39.5) — (39.5) Amounts reclassified from accumulated other comprehensive loss (4.2) 0.3 (3.9) (1.6) 0.3 (1.3) Total other comprehensive income (loss) (53.1) 0.4 (52.7) (41.1) 0.3 (40.8) Less: other comprehensive loss (income) attributable to noncontrolling interests (0.2) — (0.2) (7.3) — (7.3) Ending balance $ (366.9) $ (10.0) $ (376.9) $ (434.6) $ 19.4 $ (415.2)
Components of other comprehensive income (loss), net of tax	The components of other comprehensive income (loss), net of tax for the three and nine months ended September 30, 2021 and 2020, were as follows (in millions): Three months ended September 30, 2021 2020 Pre-tax Tax Net Pre-tax Tax Net amount impact amount amount impact amount Foreign currency translation adjustments $ (60.2) $ 0.6 $ (59.6) $ 98.2 $ (0.6) $ 97.6 Retirement benefit asset, net — — — (0.2) — (0.2) Reclassifications to net income 0.1 — 0.1 0.1 — 0.1 Total other comprehensive income (loss) $ (60.1) $ 0.6 $ (59.5) $ 98.1 $ (0.6) $ 97.5 Nine months ended September 30, 2021 2020 Pre-tax Tax Net Pre-tax Tax Net amount impact Amount amount impact Amount Foreign currency translation adjustments $ (50.5) $ 1.6 $ (48.9) $ (41.0) $ 1.5 $ (39.5) Retirement benefit asset, net — 0.1 0.1 — — — Reclassifications to net income (3.9) — (3.9) (1.3) — (1.3) Total other comprehensive income (loss) $ (54.4) $ 1.7 $ (52.7) $ (42.3) $ 1.5 $ (40.8)

Earnings and Dividends Per Sh_2

Earnings and Dividends Per Share (Tables)	9 Months Ended
Earnings and Dividends Per Share (Tables)	Sep. 30, 2021
Earnings and Dividends Per Share
Summary of earnings (loss) per share calculation	The following is a summary of the earnings (loss) per share calculation for the three and nine months ended September 30, 2021 and 2020 (in millions, except per share data): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Net income (loss) attributable to JHG $ 196.8 $ 118.9 $ 489.6 $ (25.2) Allocation of earnings to participating stock-based awards (5.4) (3.5) (14.1) — Net income (loss) attributable to JHG common shareholders $ 191.4 $ 115.4 $ 475.5 $ (25.2) Weighted-average common shares outstanding — basic 167.1 178.4 168.7 180.4 Dilutive effect of nonparticipating stock-based awards 0.7 0.4 0.7 — Weighted-average common shares outstanding — diluted 167.8 178.8 169.4 180.4 Earnings (loss) per share: Basic (two class) $ 1.15 $ 0.65 $ 2.82 $ (0.14) Diluted (two class) $ 1.14 $ 0.65 $ 2.81 $ (0.14)
Schedule of anti-dilutive securities that have not been included in the calculation of weighted average diluted shares outstanding	The following instruments are anti-dilutive and have not been included in the weighted-average diluted shares outstanding calculation (in millions): Three months ended Nine months ended September 30, September 30, 2021 2020 2021 2020 Unvested nonparticipating stock awards 0.3 0.8 0.5 1.5
Schedule of cash dividends declared and paid	The following is a summary of cash dividends paid during the nine months ended September 30, 2021: Dividend Date Dividends paid Date per share declared (in US$ millions) paid $ 0.36 February 3, 2021 $ 61.7 March 3, 2021 $ 0.38 April 28, 2021 $ 65.0 May 27, 2021 $ 0.38 July 28, 2021 $ 64.8 August 25, 2021

Consolidation - VIEs (Details)

Consolidation - VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Consolidated VIEs
Investment securities	$ 245.3	$ 214.6
Unconsolidated VIEs
Investment securities	$ 99.8	$ 9.6

Consolidation - VREs (Details)

Consolidation - VREs (Details) - USD ($) $ in Millions	1 Months Ended
Consolidation - VREs (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Consolidated VREs
Investment securities	$ 179.3	$ 29.3
Cash and cash equivalents	2.3	2.8
Other current assets	0.8	0.4
Accounts payable and accrued liabilities	(0.9)	(0.1)
Total	181.5	32.4
Redeemable noncontrolling interests in consolidated VREs	(23.5)
JHG's net interest in consolidated VREs	158	32.4
Increase in seed capital investments	163
Unconsolidated VREs
Investment securities	$ 56	$ 63.6

Investment Securities - General

Investment Securities - General Disclosure (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Short-term investments:
Estimated Fair Value	$ 690.5		$ 690.5		$ 482.7
Unrealized gains on investment securities held at period end	4.6	$ 25.5	8	$ 34.1
Seeded investment products
Short-term investments:
Seeded investment products	634.7		634.7		380.7
Investment securities \| Separate accounts
Short-term investments:
Seeded investment products	54.2		54.2		63.5
Investment securities \| Pooled investment funds
Short-term investments:
Seeded investment products	0.1		0.1		0.1
Investment securities \| Investments related to deferred compensation plans
Short-term investments:
Estimated Fair Value	50.3		50.3		96.5
Investment securities \| Other investments
Short-term investments:
Estimated Fair Value	5.5		5.5		5.5
Consolidated VIEs \| Investment securities
Short-term investments:
Seeded investment products	245.3		245.3		214.6
Consolidated VREs \| Investment securities
Short-term investments:
Seeded investment products	179.3		179.3		29.3
Unconsolidated VIEs and VREs \| Investment securities
Short-term investments:
Seeded investment products	$ 155.8		$ 155.8		$ 73.2

Investment Securities - Offsett

Investment Securities - Offsetting Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instrument Denominated in Foreign Currency
Investment gains, net	$ 4.7	$ 25.5	$ 8.1	$ 25.3
Cash flows related to investment securities
Purchases and settlements			(196.5)	48.8
Seeded investment products and derivatives
Derivative Instrument Denominated in Foreign Currency
Investment gains, net	1.4	5.2	4.4	11.2
Third-party ownership interests in seeded investment products
Derivative Instrument Denominated in Foreign Currency
Investment gains, net	3	18.1	(1.1)	8.7
Long Tail Alpha equity method investment
Derivative Instrument Denominated in Foreign Currency
Investment gains, net	0.2	0.4	2.1	6.1
Deferred Equity Plan
Derivative Instrument Denominated in Foreign Currency
Investment gains, net	0.2	1.4	2.3	(1.2)
Other investments
Derivative Instrument Denominated in Foreign Currency
Investment gains, net	$ (0.1)	$ 0.4	0.4	0.5
Investment securities
Cash flows related to investment securities
Purchases and settlements			(302.2)	(109.5)
Sales, settlements and maturities			105.7	158.3
Investment securities \| Seeded investment products \| Consolidated
Cash flows related to investment securities
Purchases and settlements			(66.9)	(69.3)
Sales, settlements and maturities			$ 8.9	$ 4.5

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Derivatives
Derivative liabilities	$ 1.9	$ 1.9
Net gains (losses) in net income related to:
Securities sold, not yet purchased			$ 7.9
Not Designated as Hedging Instrument
Derivatives
Derivative assets	12.2	12.2	9.1
Derivative liabilities	8.6	8.6	10.8
Futures \| Seeded investment products
Derivatives
Notional value of derivative	96.4	96.4	57
Futures \| Derivative Instruments \| Not Designated as Hedging Instrument
Derivatives
Notional value of derivative	373.6	373.6	164.5
Credit default swaps \| Seeded investment products
Derivatives
Notional value of derivative	5.5	5.5	1.5
Credit default swaps \| Derivative Instruments \| Not Designated as Hedging Instrument
Derivatives
Notional value of derivative	164.4	164.4	166.2
Interest rate swaps \| Seeded investment products
Derivatives
Notional value of derivative	3.8	3.8	75
Total return swaps \| Derivative Instruments \| Not Designated as Hedging Instrument
Derivatives
Notional value of derivative	59.6	59.6	35.6
Options \| Seeded investment products
Derivatives
Notional value of derivative	0.3	0.3	0.5
Forward foreign exchange contracts and swaps \| Seeded investment products
Derivatives
Notional value of derivative	83.3	83.3	56.1
Forward foreign exchange contracts and swaps \| Derivative Instruments \| Not Designated as Hedging Instrument
Derivatives
Notional value of derivative	390.3	390.3	$ 205
Forward foreign exchange contracts and swaps \| Other non-operating income (expenses), net
Net gains (losses) in net income related to:
Gain on change in fair value of derivatives	$ (0.8)	$ 0.5

Fair Value Measurements - Level

Fair Value Measurements - Level of Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Liabilities
Derivative liabilities	$ 1.9
Securities sold, not yet purchased			$ 7.9
Total redeemable noncontrolling interests	145.1		85.8
Seeded investment products
Liabilities
Total redeemable noncontrolling interests	130.2	$ 109.2	70.6	$ 70.8	$ 453.7	$ 662.8
Intech Founders
Liabilities
Total redeemable noncontrolling interests	2.2		2.9
Consolidated \| Seeded investment products
Liabilities
Total redeemable noncontrolling interests	130.2		70.6
Consolidated VIEs
Assets
Total investment securities	245.3		214.6
Unconsolidated VIEs
Assets
Total investment securities	99.8		9.6
Fair value measurements, recurring
Assets
Cash equivalents	384.5		525
Total assets	1,101.3		1,037.9
Liabilities
Securities sold, not yet purchased	2.9		7.9
Long-term debt	336.8		348.4
Total liabilities	393.6		432.5
Fair value measurements, recurring \| Deferred bonuses
Liabilities
Derivative liabilities	42.8
Current portion of long-term debt			65.2
Fair value measurements, recurring \| Forward foreign exchange contracts and swaps
Liabilities
Derivative liabilities	1.9
Fair value measurements, recurring \| Volantis
Assets
Contingent consideration	2		2.8
Fair value measurements, recurring \| Geneva
Assets
Contingent consideration	12		17.4
Fair value measurements, recurring \| Investment securities
Assets
Total investment securities	690.5		482.7
Fair value measurements, recurring \| Seed hedge derivatives
Assets
Derivative assets	12.2		9.1
Liabilities
Derivative liabilities	8.6		10.8
Fair value measurements, recurring \| Level 1
Assets
Cash equivalents	384.5		525
Total assets	997.8		881.6
Liabilities
Securities sold, not yet purchased	2.9		7.9
Total liabilities	2.9		7.9
Fair value measurements, recurring \| Level 1 \| Investment securities
Assets
Total investment securities	613.3		356.6
Fair value measurements, recurring \| Level 2
Assets
Total assets	82.7		124.9
Liabilities
Long-term debt	336.8		348.4
Total liabilities	347.9		359.4
Fair value measurements, recurring \| Level 2 \| Forward foreign exchange contracts and swaps
Liabilities
Derivative liabilities	1.9
Fair value measurements, recurring \| Level 2 \| Investment securities
Assets
Total investment securities	70.4		114.9
Fair value measurements, recurring \| Level 2 \| Seed hedge derivatives
Assets
Derivative assets	12.2		9.1
Liabilities
Derivative liabilities	8.6		10.8
Fair value measurements, recurring \| Level 3
Assets
Total assets	20.8		31.4
Liabilities
Total liabilities	42.8		65.2
Fair value measurements, recurring \| Level 3 \| Deferred bonuses
Liabilities
Derivative liabilities	42.8
Current portion of long-term debt			65.2
Fair value measurements, recurring \| Level 3 \| Volantis
Assets
Contingent consideration	2		2.8
Fair value measurements, recurring \| Level 3 \| Geneva
Assets
Contingent consideration	12		17.4
Fair value measurements, recurring \| Level 3 \| Investment securities
Assets
Total investment securities	6.8		11.2
Fair value measurements, recurring \| Consolidated \| Seeded investment products
Assets
Derivative assets	0.1		0.9
Liabilities
Derivative liabilities	0.6		0.2
Fair value measurements, recurring \| Consolidated \| Level 2 \| Seeded investment products
Assets
Derivative assets	0.1		0.9
Liabilities
Derivative liabilities	0.6		0.2
Fair value measurements, recurring \| Consolidated VIEs \| Investment securities
Assets
Total investment securities	245.3		214.6
Fair value measurements, recurring \| Consolidated VIEs \| Level 1 \| Investment securities
Assets
Total investment securities	194.7		125.7
Fair value measurements, recurring \| Consolidated VIEs \| Level 2 \| Investment securities
Assets
Total investment securities	43.8		77.7
Fair value measurements, recurring \| Consolidated VIEs \| Level 3 \| Investment securities
Assets
Total investment securities	6.8		11.2
Fair value measurements, recurring \| Unconsolidated VIEs \| Investment securities
Assets
Total investment securities	445.2		268.1
Fair value measurements, recurring \| Unconsolidated VIEs \| Level 1 \| Investment securities
Assets
Total investment securities	418.6		230.9
Fair value measurements, recurring \| Unconsolidated VIEs \| Level 2 \| Investment securities
Assets
Total investment securities	$ 26.6		$ 37.2

Fair Value Measurements - Genev

Fair Value Measurements - Geneva Contingent Consideration (Details) - USD ($) $ in Millions	Mar. 17, 2020	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 03, 2019
Dispositions
Period of time for earnout payments	5 years
Gain on the sale of Geneva				$ 16.2
Receipt of contingent consideration payments from sale of Geneva			$ 5.4	$ 1.6
Geneva
Dispositions
Ownership sold (as a percent)	100.00%				100.00%
Consideration received	$ 38.4
Receipt of contingent consideration payments from sale of Geneva		$ 1.9	$ 5.4
Geneva \| Minimum
Dispositions
Contingent consideration	20.5
Geneva \| Maximum
Dispositions
Contingent consideration	$ 35

Fair Value Measurements - Volan

Fair Value Measurements - Volantis Contingent Consideration (Details) £ in Millions, $ in Millions	Mar. 17, 2020	Apr. 01, 2017GBP (£)	Sep. 30, 2021GBP (£)	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Dispositions
Period of performance of investee for recognizing consideration	5 years
Discontinued Operations, Disposed of by Sale
Dispositions
Fair value of contingent consideration				$ 2
Business Combination, Contingent Consideration, Asset				$ 2
Volantis \| Discontinued Operations, Disposed of by Sale
Dispositions
Percentage of share for consideration of sale		10.00%
Period of performance of investee for recognizing consideration		3 years
Fair value of contingent consideration					$ 2.8
Business Combination, Contingent Consideration, Asset					$ 2.8
Certain fund
Dispositions
Percentage of share for consideration of sale		50.00%
Performance fee threshold \| £		£ 12	£ 12

Fair Value Measurements - Lev_2

Fair Value Measurements - Level 3 Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Change in fair value of Level 3 assets
Balance at the beginning of period, Asset value	$ 26.5	$ 29.2	$ 31.4	$ 12.8
Geneva contingent consideration		(1.4)		18.9
Settlements	(5.2)		(9.2)	(2.2)
Purchases of securities		0.2	2.7	0.5
Sales of securities			(1.1)
Fair value adjustments	(0.2)	(1.6)	(2.7)	(3.3)
Foreign currency translation	(0.3)	0.2	(0.3)	(0.1)
Balance at the end of period, Asset value	20.8	26.6	20.8	26.6
Consolidated VIEs
Changes in fair value
Investment securities	245.3		245.3		$ 214.6
Level 3 \| Fair value measurements, recurring \| Contingent consideration
Changes in fair value
Balance at the beginning of period, Liability Value				21.2
Fair value adjustments				(7.1)
Unrealized gains (losses)				0.3
Distributions				(13.8)
Foreign currency translation				(0.6)
Level 3 \| Fair value measurements, recurring \| Deferred bonuses
Changes in fair value
Balance at the beginning of period, Liability Value	35.6	42.9	65.2	76.6
Fair value adjustments	1.1	0.8	5.4	(0.3)
Vesting of deferred bonuses	(0.9)	(1.4)	(51.6)	(48.1)
Amortization of deferred bonuses	7.9	8.1	24	26.7
Foreign currency translation	(0.9)	1.8	(0.2)	(2.7)
Balance at the end of period, Liability Value	$ 42.8	$ 52.2	$ 42.8	$ 52.2

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 17, 2020	Dec. 03, 2019
Indefinite-lived intangible assets:
Disposal					$ 17.9
Definite-lived intangible assets:
Disposal					17.9
Foreign currency translation					(0.3)
Accumulated amortization, balance at the beginning of the period			$ (147.2)	$ (100.7)	(147.2)
Amortization				(5.8)	(10.5)
Disposal					61.4
Foreign currency translation				1.5	0.6
Accumulated amortization, balance at the end of the period				(105)	(95.7)
Net intangible assets
Net intangible assets, balance at the beginning of the period			3,088.6	2,686.3	3,088.6
Amortization				(5.8)	(10.5)
Impairment				(44.4)	(390.2)
Foreign currency translation				(15.2)	(12.5)
Net intangible assets, balance at the end of the period				2,620.9	2,657.5
Goodwill
Goodwill, balance at the beginning of the period			1,504.3	1,383.9	1,504.3
Disposal					(23.5)
Impairment			123.5		123.5
Foreign currency translation				(13.1)	(15.4)
Goodwill, balance at the end of the period				1,370.8	1,341.9
Goodwill and intangible assets impairment				44.4	513.7
Sale
Intangible assets, net				2,620.9	2,657.5
Disposal of goodwill					23.5
Geneva
Goodwill
Disposal						$ (23.5)
Sale
Ownership sold (as a percent)						100.00%	100.00%
Intangible assets, net						$ 17.9
Disposal of goodwill						23.5
Consideration received						$ 38.4
Client relationships
Indefinite-lived intangible assets:
Disposal					79.3
Definite-lived intangible assets:
Balance at the beginning of the period			364.7	170.9	364.7
Disposal					79.3
Impairment			92.6		119
Foreign currency translation				(2.9)
Balance at the end of the period				168	166.1
VelocityShares ETNs
Goodwill
Goodwill and intangible assets impairment	$ 26.4
Investment management agreements
Indefinite-lived intangible assets:
Balance at the beginning of the period			2,490.3	2,242.9	2,490.3
Impairment			(263.5)	(40.8)
Foreign currency translation				(13.7)	(12.7)
Balance at the end of the period				2,188.4	2,214.1
Indefinite-Lived Intangible Assets				2,188.4	2,214.1
Net intangible assets
Impairment					(263.5)
Certain indefinite-lived Intangible Assets
Indefinite-lived intangible assets:
Impairment		$ (40.8)
Balance at the end of the period		0
Indefinite-Lived Intangible Assets		$ 0
Trademarks
Indefinite-lived intangible assets:
Balance at the beginning of the period			380.8	373.2	380.8
Impairment			$ (7.7)	(3.6)	(7.7)
Foreign currency translation				(0.1)	(0.1)
Balance at the end of the period				369.5	373
Indefinite-Lived Intangible Assets				369.5	$ 373
Perkins Trademark
Indefinite-lived intangible assets:
Impairment				$ (3.6)

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Future Amortization (Details) $ in Millions	Sep. 30, 2021USD ($)
Future Amortization:
2021 (remainder of year)	$ 1.9
2022	7.6
2023	7.3
2024	5.9
2025	5.9
Thereafter	34.4
Total	$ 63

Debt (Details)

Debt (Details) $ in Millions	9 Months Ended
Debt (Details) $ in Millions	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
4.875% Senior Notes due 2025
Components of debt
Interest rate (as a percent)	4.875%
Other Disclosures
Face value of debt issued	$ 300
4.875% Senior Notes due 2025 \| Carrying value
Components of debt
Total debt	311.1	$ 313.3
4.875% Senior Notes due 2025 \| Fair value
Components of debt
Total debt	336.8	$ 348.4
Credit Facility
Other Disclosures
Credit facility, maximum borrowing capacity	$ 200
Credit facility covenant terms, financing leverage ratio, maximum	3
Borrowings under the Credit Facility	$ 0
Janus Capital Group Inc \| 4.875% Senior Notes due 2025
Other Disclosures
Unamortized premium, net	$ 11.1

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income taxes
Effective tax rate (as a percent)	21.00%	22.90%	26.50%	(15.30%)
Adjustment to deferred tax assets and liabilities			$ 31
Unrecognized tax benefits	$ 14.9		14.9		$ 15.8
Anticipated decrease in income tax benefits in the next 12 months	$ 0.6		$ 0.6
UK
Income taxes
Statutory corporation tax rate (as a percentage)	19.00%		19.00%
Enacted tax rate scheduled for April 2023 (as a percent)			25.00%
Statutory corporate tax rate not enacted (as a percent)	17.00%

Noncontrolling Interests - Rede

Noncontrolling Interests - Redeemable (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Redeemable Noncontrolling Interests
Total redeemable noncontrolling interests	$ 145.1	$ 85.8
Seeded investment products
Redeemable Noncontrolling Interests
Total redeemable noncontrolling interests	130.2	70.6	$ 109.2	$ 70.8	$ 453.7	$ 662.8
Intech Founders
Redeemable Noncontrolling Interests
Total redeemable noncontrolling interests	$ 2.2	2.9
Remaining interest (as a percent)	1.10%
Consolidated \| Seeded investment products
Redeemable Noncontrolling Interests
Total redeemable noncontrolling interests	$ 130.2	70.6
Intech \| Intech
Redeemable Noncontrolling Interests
INTECH employee appreciation rights	$ 12.7	$ 12.3

Noncontrolling interests - Seed

Noncontrolling interests - Seeded Investment Products (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Roll forward of redeemable noncontrolling interests in consolidated seed investment products
Opening balance			$ 85.8
Closing balance	$ 145.1		145.1
Seeded investment products
Roll forward of redeemable noncontrolling interests in consolidated seed investment products
Opening balance	109.2	$ 453.7	70.6	$ 662.8
Changes in market value	3	18.8	0.6	10.9
Changes in ownership	18.4	(413.1)	58.5	(610)
Foreign currency translation	(0.4)	11.4	0.5	7.1
Closing balance	$ 130.2	$ 70.8	$ 130.2	$ 70.8

Noncontrolling Interests - Nonr

Noncontrolling Interests - Nonredeemable (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Nonredeemable noncontrolling interests
Total nonredeemable noncontrolling interests	$ 15.6	$ 17.4
Seeded investment products
Nonredeemable noncontrolling interests
Total nonredeemable noncontrolling interests	2.9	4.6
Intech
Nonredeemable noncontrolling interests
Total nonredeemable noncontrolling interests	$ 12.7	$ 12.8

Long-Term Incentive and Employe

Long-Term Incentive and Employee Compensation (Details) - shares shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Long-Term Incentive and Employee Compensation
Units granted	1.1	145
Minimum
Long-Term Incentive and Employee Compensation
Vesting period		3 years
Maximum
Long-Term Incentive and Employee Compensation
Vesting period		4 years
Restricted Stock Awards
Long-Term Incentive and Employee Compensation
Units granted	1	69.5
Mutual Fund Share Awards
Long-Term Incentive and Employee Compensation
Units granted	0.1	75.5

Retirement benefit plans - Actu

Retirement benefit plans - Actuarial gains(losses), benefit cost, cash flows (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of net periodic benefit cost
Service cost	$ (0.2)	$ (0.2)	$ (0.7)	$ (0.6)
Interest cost	(2.8)	(4.3)	(8.4)	(12.9)
Amortization of prior service cost	(0.1)	(0.1)	(0.3)	(0.3)
Expected return on plan assets	3.3	4.7	10	13.9
Net periodic benefit credit	$ 0.2	$ 0.1	$ 0.6	$ 0.1

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in accumulated other comprehensive loss, net of tax
Beginning balance			$ 4,716.4
Other comprehensive income (loss), net of tax	$ (59.5)	$ 97.5	(52.7)	$ (40.8)
Less: other comprehensive loss (income) attributable to noncontrolling interests	0.8	(11)	(0.2)	(7.3)
Ending balance	4,646.6		4,646.6
Accumulated other comprehensive loss
Changes in accumulated other comprehensive loss, net of tax
Beginning balance	(318.2)	(501.7)	(324)	(367.1)
Other comprehensive income (loss)	(59.6)	97.4	(48.8)	(39.5)
Amounts reclassified from accumulated other comprehensive income (loss)	0.1	0.1	(3.9)	(1.3)
Other comprehensive income (loss), net of tax	(59.5)	97.5	(52.7)	(40.8)
Less: other comprehensive loss (income) attributable to noncontrolling interests	0.8	(11)	(0.2)	(7.3)
Ending balance	(376.9)	(415.2)	(376.9)	(415.2)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss, net of tax
Beginning balance	(308.1)	(521)	(313.6)	(386.2)
Other comprehensive income (loss)	(59.6)	97.6	(48.9)	(39.5)
Amounts reclassified from accumulated other comprehensive income (loss)		(0.2)	(4.2)	(1.6)
Other comprehensive income (loss), net of tax	(59.6)	97.4	(53.1)	(41.1)
Less: other comprehensive loss (income) attributable to noncontrolling interests	0.8	(11)	(0.2)	(7.3)
Ending balance	(366.9)	(434.6)	(366.9)	(434.6)
Retirement benefit asset, net
Changes in accumulated other comprehensive loss, net of tax
Beginning balance	(10.1)	19.3	(10.4)	19.1
Other comprehensive income (loss)		(0.2)	0.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.1	0.3	0.3	0.3
Other comprehensive income (loss), net of tax	0.1	0.1	0.4	0.3
Ending balance	$ (10)	$ 19.4	$ (10)	$ 19.4

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - OCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated other comprehensive loss
Other comprehensive income, net of tax
Pre-tax amount	$ (60.1)	$ 98.1	$ (54.4)	$ (42.3)
Tax impact	0.6	(0.6)	1.7	1.5
Net amount	(59.5)	97.5	(52.7)	(40.8)
Foreign currency translation adjustments
Other comprehensive income, net of tax
Pre-tax amount	(60.2)	98.2	(50.5)	(41)
Tax impact	0.6	(0.6)	1.6	1.5
Net amount	(59.6)	97.6	(48.9)	(39.5)
Retirement benefit asset, net
Other comprehensive income, net of tax
Pre-tax amount		(0.2)
Tax impact			0.1
Net amount		(0.2)	0.1
Reclassification to net income
Other comprehensive income, net of tax
Pre-tax amount	0.1	0.1	(3.9)	(1.3)
Net amount	$ 0.1	$ 0.1	$ (3.9)	$ (1.3)

Earnings and Dividends Per Sh_3

Earnings and Dividends Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Oct. 27, 2021	Aug. 25, 2021	Jul. 28, 2021	May 27, 2021	Apr. 28, 2021	Mar. 03, 2021	Feb. 03, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings (loss) per share
Net income (loss) attributable to JHG								$ 196.8	$ 118.9	$ 489.6	$ (25.2)
Allocation of earnings to participating stock-based awards								(5.4)	(3.5)	(14.1)
Net income (loss) attributable to JHG common shareholders								$ 191.4	$ 115.4	$ 475.5	$ (25.2)
Weighted-average common shares outstanding - basic								167.1	178.4	168.7	180.4
Dilutive effect of non-participating stock-based awards								0.7	0.4	0.7
Weighted-average common shares outstanding - diluted								167.8	178.8	169.4	180.4
Earnings per share:
Basic (two class)								$ 1.15	$ 0.65	$ 2.82	$ (0.14)
Diluted (two class)								1.14	0.65	2.81	(0.14)
Dividends Per Share
Dividends paid (per share)								$ 0.38	$ 0.36	$ 1.12	$ 1.08
Cash dividend declared (in dollars per share)	$ 0.38		$ 0.38		$ 0.38		$ 0.36
Cash dividends paid		$ 64.8		$ 65		$ 61.7				$ 191.5	$ 198.1
Unvested nonparticipating stock awards
Anti-dilutive securities that have not been included in the calculation of weighted average diluted shares outstanding
Number of anti-dilutive securities that have not been included in the calculation of weighted average diluted shares outstanding								0.3	0.8	0.5	1.5

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transactions
Shares repurchased amount		$ 75	$ 50.2	$ 305.2	$ 103.4
Dai-ichi Life \| Secondary Offering
Related Party Transactions
Shares issued	30,668,922
Shares repurchased (shares)	8,048,360
Shares repurchased amount	$ 230