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Investments (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Investments
The amortized cost, gross unrealized gains, gross unrealized losses, allowance for credit losses, and fair value of fixed maturity investments were as follows:
September 30, 2021
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
Fixed maturities
U.S. Governments$404.8 $7.5 $2.1 $— $410.2 
Foreign Governments229.3 2.7 2.7 0.2 229.1 
Obligations of states and political subdivisions169.9 6.7 0.9 — 175.7 
Corporate bonds1,996.2 47.8 14.4 6.6 2,023.0 
Commercial mortgage-backed securities403.1 9.1 3.0 — 409.2 
Residential mortgage-backed securities488.1 10.6 4.8 — 493.9 
Asset-backed securities110.9 2.2 0.1 0.2 112.8 
Collateralized loan obligations342.9 1.8 1.3 — 343.4 
Total fixed maturities$4,145.2 $88.4 $29.3 $7.0 $4,197.3 
December 31, 2020
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
Fixed maturities
U.S. Governments$385.4 $14.7 $0.3 $— $399.8 
Foreign Governments284.1 11.6 0.7 0.2 294.8 
Obligations of states and political subdivisions163.1 7.7 0.3 0.1 170.4 
Corporate bonds1,925.9 75.3 13.3 6.1 1,981.8 
Commercial mortgage-backed securities324.8 15.2 0.3 — 339.7 
Residential mortgage-backed securities491.4 17.4 0.6 — 508.2 
Asset-backed securities120.5 2.9 0.4 0.2 122.8 
Collateralized loan obligations285.9 4.9 1.2 — 289.6 
Total fixed maturities$3,981.1 $149.7 $17.1 $6.6 $4,107.1 
Schedule of Amortized Cost and Fair Values of Fixed Maturity Investments, by Contractual Maturity The amortized cost and fair values of fixed maturity investments as of September 30, 2021, by contractual maturity, were as follows:
(in millions)Amortized
Cost		Fair
Value
Due in one year or less$288.7 $292.9 
Due after one year through five years1,670.6 1,695.1 
Due after five years through ten years719.6 728.6 
Due after ten years121.3 121.4 
Structured securities1,345.0 1,359.3 
Total$4,145.2 $4,197.3 
Schedule of Carrying Value and Unfunded Investment Commitments of Other Invested Assets Portfolio
Details regarding the carrying value and unfunded investment commitments of other investments as of September 30, 2021 and December 31, 2020 were as follows:
September 30, 2021
(in millions)Carrying
Value		Unfunded
Commitments
Investment Type
Hedge funds$102.1 $— 
Private equity254.3 63.0 
Overseas deposits64.6 — 
Other4.8 — 
Total other investments$425.8 $63.0 
December 31, 2020
(in millions)Carrying
Value		Unfunded
Commitments
Investment Type
Hedge funds$111.2 $— 
Private equity211.4 80.0 
Overseas deposits102.1 — 
Other4.7 — 
Total other investments$429.4 $80.0 
Schedule of Aging of Unrealized Losses on Company's Investments in Fixed Maturities, Equity Securities and Other Investments An aging of unrealized losses on our investments in fixed maturities is presented below:
September 30, 2021Less Than One YearOne Year or GreaterTotal
(in millions)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Fixed maturities
U.S. Governments$161.1 $1.7 $5.6 $0.4 $166.7 $2.1 
Foreign Governments117.7 2.4 1.3 0.3 119.0 2.7 
Obligations of states and political subdivisions28.3 0.5 0.4 0.4 28.7 0.9 
Corporate bonds626.4 10.8 40.7 3.6 667.1 14.4 
Commercial mortgage-backed securities136.9 2.6 8.9 0.4 145.8 3.0 
Residential mortgage-backed securities207.4 4.6 4.8 0.2 212.2 4.8 
Asset-backed securities21.3 0.1 — — 21.3 0.1 
Collateralized loan obligations126.8 1.3 2.4 — 129.2 1.3 
Total fixed maturities$1,425.9 $24.0 $64.1 $5.3 $1,490.0 $29.3 
December 31, 2020Less Than One YearOne Year or GreaterTotal
(in millions)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Fixed maturities
U.S. Governments$40.6 $0.3 $— $— $40.6 $0.3 
Foreign Governments18.0 0.5 0.1 0.2 18.1 0.7 
Obligations of states and political subdivisions5.2 0.3 — — 5.2 0.3 
Corporate bonds202.5 6.7 17.5 6.6 220.0 13.3 
Commercial mortgage-backed securities21.8 0.3 — — 21.8 0.3 
Residential mortgage-backed securities74.4 0.4 3.0 0.2 77.4 0.6 
Asset-backed securities4.6 0.4 — — 4.6 0.4 
Collateralized loan obligations121.1 0.9 49.1 0.3 170.2 1.2 
Total fixed maturities$488.2 $9.8 $69.7 $7.3 $557.9 $17.1 
Debt Securities, Available-for-sale, Allowance for Credit Loss
The following table presents a roll-forward of the changes in allowance for credit losses on available-for-sale fixed maturities by industry category for the three and nine months ending September 30, 2021 and 2020, respectively:
(in millions)Foreign GovernmentsObligations of states and political subdivisionsCorporate bondsAsset backed securitiesTotal
Beginning balance, June 30, 2021$0.2 $— $6.2 $— $6.4 
Securities for which allowance was not previously recorded— — 0.7 0.2 0.9 
Securities sold during the period— — (0.2)— (0.2)
Additional net increases (decreases) in existing allowance— — (0.1)— (0.1)
Ending balance, September 30, 2021$0.2 $— $6.6 $0.2 $7.0 
(in millions)Foreign GovernmentsObligations of states and political subdivisionsCorporate bondsAsset backed securitiesTotal
Beginning balance, June 30, 2020$0.3 $0.1 $39.7 $0.1 $40.2 
Securities for which allowance was not previously recorded0.1 — 13.6 — 13.7 
Securities sold during the period(0.2)— (14.7)— (14.9)
Additional net increases (decreases) in existing allowance— 0.1 (6.4)1.0 (5.3)
Ending balance, September 30, 2020$0.2 $0.2 $32.2 $1.1 $33.7 

(in millions)Foreign GovernmentsObligations of states and political subdivisionsCorporate bondsAsset backed securitiesTotal
Beginning balance, January 1, 2021$0.2 $0.1 $6.1 $0.2 $6.6 
Securities for which allowance was not previously recorded— — 2.7 0.2 2.9 
Securities sold during the period— — (1.1)— (1.1)
Additional net increases (decreases) in existing allowance— (0.1)(1.1)(0.2)(1.4)
Ending balance, September 30, 2021$0.2 $— $6.6 $0.2 $7.0 

(in millions)Foreign GovernmentsObligations of states and political subdivisionsCorporate bondsAsset backed securitiesTotal
Beginning balance, January 1, 2020$— $— $— $— $— 
Additions-initial adoption of accounting standard— — 6.8 0.1 6.9 
Securities for which allowance was not previously recorded0.3 0.3 14.4 — 15.0 
Securities sold during the period(0.2)— (15.5)— (15.7)
Additional net increases (decreases) in existing allowance0.1 (0.1)26.5 1.0 27.5 
Ending balance, September 30, 2020$0.2 $0.2 $32.2 $1.1 $33.7 
Schedule of Company's Gross Realized Investment Gains (Losses)
The following table presents our gross realized investment gains (losses):
For the Three Months Ended
September 30,		For the Nine Months Ended
September 30,
(in millions)2021202020212020
Realized gains on fixed maturities and other
Fixed maturities$3.3 $7.2 $26.3 $30.5 
Other investments, including short-terms0.9 10.8 8.9 70.7 
Other assets— — 3.4 32.3 
4.2 18.0 38.6 133.5 
Realized losses on fixed maturities and other
Fixed maturities(0.4)(7.5)(5.0)(25.7)
Other investments, including short-terms(3.3)(12.6)(16.6)(58.4)
Other assets(1.4)(0.4)(14.0)(0.9)
Credit losses on fixed maturities(0.7)(10.5)(1.5)(43.0)
(5.8)(31.0)(37.1)(128.0)
Equity securities
Net realized gains (losses) on equity securities1.4 (3.2)0.3 (15.8)
Change in unrealized gains (losses) on equity securities held at the end of the period(5.1)10.5 30.7 (13.7)
Net realized gains (losses) on equity securities(3.7)7.3 31.0 (29.5)
Net realized investment and other gains (losses) before income taxes(5.3)(5.7)32.5 (24.0)
Income tax (benefit) provision— (0.5)— (1.7)
Net realized investment gains (losses), net of income taxes$(5.3)$(5.2)$32.5 $(22.3)
Schedule of Changes in Unrealized Appreciation (Depreciation)
Changes in unrealized gains (losses) related to investments are summarized as follows:
For the Three Months Ended
September 30,		For the Nine Months Ended
September 30,
(in millions)2021202020212020
Change in unrealized gains (losses)
Fixed maturities$(23.0)$42.5 $(70.7)$66.9 
Other investments— 0.2 — (14.0)
Other and short-term investments(0.3)— (0.6)— 
Net unrealized investment gains (losses) before income taxes(23.3)42.7 (71.3)52.9 
Income tax provision (benefit)(4.4)7.0 (13.0)12.2 
Net unrealized investment gains (losses), net of income taxes$(18.9)$35.7 $(58.3)$40.7 
Schedule of Fair Value of Foreign Currency Exchange Forward Contracts
The fair value of our foreign currency exchange forward contracts as of September 30, 2021 and December 31, 2020 was as follows:
(in millions)September 30, 2021December 31, 2020
Operational currency exposure$(0.3)$0.4 
Asset manager investment exposure2.0 (0.2)
Total return strategy(3.4)0.7 
Total$(1.7)$0.9 
Schedule of Realized Gains and Losses of Investment on Foreign Currency Exchange Forward Contracts The following table represents our gross investment realized gains and losses on our foreign currency exchange forward contracts:
For the Three Months Ended
September 30,		For the Nine Months Ended
September 30,
(in millions)2021202020212020
Realized gains
Operational currency exposure$— $4.2 $7.1 $10.1 
Asset manager investment exposure1.0 — 2.8 1.0 
Total return strategy6.9 10.3 13.0 43.5 
Gross realized investment gains7.9 14.5 22.9 54.6 
Realized losses
Operational currency exposure(5.2)(1.8)(17.8)(6.5)
Asset manager investment exposure— (0.9)(0.8)(1.9)
Total return strategy(6.9)(10.4)(12.0)(47.0)
Gross realized investment losses(12.1)(13.1)(30.6)(55.4)
Net realized investment (losses) gains on foreign currency exchange forward contracts
$(4.2)$1.4 $(7.7)$(0.8)
Schedule of Restricted Assets The following table presents our components of restricted assets:
(in millions)September 30, 2021December 31, 2020
Securities on deposit for regulatory and other purposes$205.3 $227.5 
Securities pledged as collateral for letters of credit and other191.0 189.4 
Securities and cash on deposit supporting Lloyd’s business (1)
331.2 409.2 
Total restricted investments$727.5 $826.1 
(1) As the corporate member for our Lloyd’s syndicates, Argo’s share of Argo (No. 604) Limited’s required Funds to maintain at Lloyd’s was $397.9 million at September 30, 2021, of which $179.0 million was provided by Argo Re, Ltd. (“Argo Re.”)
Financial Assets Measured at Fair Value on Recurring Basis
Based on an analysis of the inputs, our financial assets measured at fair value on a recurring basis have been categorized as follows:
Fair Value Measurements at Reporting Date Using
(in millions)September 30,
2021
Level 1 (a)
Level 2 (b)
Level 3 (c)
Fixed maturities
U.S. Governments$410.2 $398.3 $11.9 $— 
Foreign Governments229.1 — 229.1 — 
Obligations of states and political subdivisions175.7 — 175.7 — 
Corporate bonds2,023.0 — 2,019.2 3.8 
Commercial mortgage-backed securities409.2 — 409.2 — 
Residential mortgage-backed securities493.9 — 493.9 — 
Asset-backed securities112.8 — 112.8 — 
Collateralized loan obligations343.4 — 343.4 — 
Total fixed maturities4,197.3 398.3 3,795.2 3.8 
Equity securities181.8 156.3 — 25.5 
Other investments65.1 — 65.1 — 
Short-term investments508.6 497.4 11.2 — 
$4,952.8 $1,052.0 $3,871.5 $29.3 
(a)Quoted prices in active markets for identical assets
(b)Significant other observable inputs
(c)Significant unobservable inputs

Fair Value Measurements at Reporting Date Using
(in millions)December 31,
2020
Level 1 (a)
Level 2 (b)
Level 3 (c)
Fixed maturities
U.S. Governments$399.8 $383.5 $16.3 $— 
Foreign Governments294.8 — 294.8 — 
Obligations of states and political subdivisions170.4 — 170.4 — 
Corporate bonds1,981.8 — 1,974.8 7.0 
Commercial mortgage-backed securities339.7 — 339.7 — 
Residential mortgage-backed securities508.2 — 508.2 — 
Asset-backed securities122.8 — 122.8 — 
Collateralized loan obligations289.6 — 289.6 — 
Total fixed maturities4,107.1 383.5 3,716.6 7.0 
Equity securities176.7 159.2 — 17.5 
Other investments102.5 0.4 102.1 — 
Short-term investments542.6 526.5 16.1 — 
$4,928.9 $1,069.6 $3,834.8 $24.5 
(a)Quoted prices in active markets for identical assets
(b)Significant other observable inputs
(c)Significant unobservable inputs
Schedule of Reconciliation of Beginning and Ending Balances for Investments Categorized as Level 3
A reconciliation of the beginning and ending balances for the investments categorized as Level 3 are as follows:
Fair Value Measurements Using Observable Inputs (Level 3)
(in millions)Corporate BondsEquity
Securities		Short Term InvestmentsTotal
Beginning balance, January 1, 2021$7.0 $17.5 $— $24.5 
Transfers into Level 3— 1.5 — 1.5 
Transfers out of Level 3— — — — 
Total gains or losses (realized/unrealized):
Included in net income 0.1 6.5 — 6.6 
Included in other comprehensive income0.1 — — 0.1 
Purchases, issuances, sales, and settlements:
Purchases0.1 — — 0.1 
Issuances— — — — 
Sales(3.5)— — (3.5)
Settlements— — — — 
 Ending balance, September 30, 2021$3.8 $25.5 $— $29.3 
Amount of total gains or losses for the year included in net income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2021$— $— $— $— 
(in millions)Credit FinancialEquity
Securities		Total
Beginning balance, January 1, 2020$7.4 $18.2 $25.6 
Transfers into Level 3— — — 
Transfers out of Level 3— — — 
Total gains or losses (realized/unrealized):
Included in net income— (5.9)(5.9)
Included in other comprehensive loss(0.5)— (0.5)
Purchases, issuances, sales, and settlements:
Purchases0.1 5.2 5.3 
Issuances— — — 
Sales— — — 
Settlements— — — 
 Ending balance, December 31, 2020$7.0 $17.5 $24.5 
Amount of total gains or losses for the year included in net income attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2020$— $— $—