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Investments (Tables)
 12 Months Ended
Dec. 31, 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 and fair value in fixed maturity investments were as follows:
December 31, 2021    
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
Allowance for Credit Losses(1)
Fair
Value
Fixed maturities
U.S. Governments$422.7 $5.5 $3.2 $— $425.0 
Foreign Governments234.7 2.2 3.9 0.2 232.8 
Obligations of states and political subdivisions166.7 5.8 1.2 — 171.3 
Corporate bonds1,972.3 33.5 20.3 2.2 1,983.3 
Commercial mortgage-backed securities416.7 6.3 4.3 — 418.7 
Residential mortgage-backed securities480.7 7.5 5.7 — 482.5 
Asset-backed securities173.0 1.3 0.6 0.1 173.6 
Collateralized loan obligations336.4 1.3 1.6 — 336.1 
Total fixed maturities$4,203.2 $63.4 $40.8 $2.5 $4,223.3 
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 December 31, 2021, by contractual maturity, were as follows:
(in millions)Amortized
Cost		Fair
Value
Due in one year or less$281.7 $284.6 
Due after one year through five years1,692.0 1,704.8 
Due after five years through ten years710.0 711.3 
Thereafter112.6 111.6 
Structured securities1,406.9 1,411.0 
Total$4,203.2 $4,223.3 
Schedule of Carrying Value Redemption Characteristics and Unfunded Investment Commitments of Other Invested Assets Portfolio
Details regarding the carrying value and unfunded investment commitments of the other invested assets portfolio as of December 31, 2021 and 2020 were as follows:
December 31, 2021  
(in millions)Carrying
Value		Unfunded
Commitments
Investment Type  
Hedge funds$58.6 $— 
Private equity248.9 64.2 
Overseas deposits74.9 — 
Other4.8 — 
Total other investments$387.2 $64.2 
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:
December 31, 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$193.4 $2.6 $14.6 $0.6 $208.0 $3.2 
Foreign Governments152.4 3.3 2.6 0.6 155.0 3.9 
Obligations of states and political subdivisions46.0 0.8 0.1 0.4 46.1 1.2 
Corporate bonds854.3 18.3 41.7 2.0 896.0 20.3 
Commercial mortgage-backed securities198.8 4.1 6.5 0.2 205.3 4.3 
Residential mortgage-backed securities284.2 5.6 4.0 0.1 288.2 5.7 
Asset-backed securities62.6 0.6 — 62.6 0.6 
Collateralized loan obligations176.1 1.6 0.5 176.6 1.6 
Total fixed maturities$1,967.8 $36.9 $70.0 $3.9 $2,037.8 $40.8 
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 obligations 121.1 0.9 49.1 0.3 170.2 1.2 
Total fixed maturities$488.2 $9.8 $69.7 $7.3 $557.9 $17.1 
Schedule of Debt Securities, Available-for-sale, Allowance for Credit Loss
Foreign GovernmentsObligations of states and political subdivisionsCorporate bondsAsset backed securitiesTotal
Beginning balance, January 1, 2020$— $— $— $— $— 
Additions-initial adoption of accounting standard— — 6.8 0.1 6.9 
Securities for which allowance was not previously recorded0.3 0.3 15.3 — 15.9 
Securities sold during the period(0.2)— (39.0)(0.1)(39.3)
Additional net increases (decreases) in existing allowance0.1 (0.2)23.0 0.2 23.1 
Ending balance, December 31, 2020$0.2 $0.1 $6.1 $0.2 $6.6 

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 — — (3.5)— (3.5)
Additional net increases (decreases) in existing allowance — (0.1)(3.1)(0.3)(3.5)
Ending balance, December 31, 2021$0.2 $— $2.2 $0.1 $2.5 
Schedule of Investment Income and Expenses Investment income and expenses were as follows:
 For the Years Ended December 31,
(in millions)202120202019
Investment income:
   Interest on fixed maturities$98.9 $108.6 $129.5 
   Dividends on equity securities3.1 2.8 11.1 
   Income on alternative investments95.5 10.4 22.4 
   Income on short-term and other investments3.3 3.9 8.9 
Investment income200.8 125.7 171.9 
Investment expenses(13.2)(13.0)(20.8)
Net investment income$187.6 $112.7 $151.1 
Schedule of Company's Gross Realized Investment Gains (Losses)
The following table presents our realized investment gains (losses):
 For the Years Ended December 31,
(in millions)202120202019
Realized gains on fixed maturities and other   
Fixed maturities$30.6 $37.1 $22.2 
Other investments, including short-terms9.8 93.8 0.1 
Other assets3.3 33.2 33.0 
43.7 164.1 55.3 
Realized losses on fixed maturities and other
Fixed maturities(11.8)(35.2)(11.7)
Other investments, including short-terms(18.5)(78.6)(31.3)
Other assets(12.5)(7.2)— 
(42.8)(121.0)(43.0)
Net (losses) recognized on fixed maturities and other
Credit losses on fixed maturities0.6 (39.9)— 
Other-than-temporary impairment losses— — (20.3)
     Other(6.3)— — 
(5.7)(39.9)(20.3)
Equity securities
Net realized gains (losses) on equity securities71.5 (17.1)128.9 
Change in unrealized gains (losses) on equity securities held at the end of the period(34.1)10.3 (40.8)
Net realized gains (losses) on equity securities37.4 (6.8)88.1 
Net realized investment and other gains (losses) before income taxes32.6 (3.6)80.1 
Income tax (benefit) provision6.2 1.3 16.2 
Net realized investment gains (losses), net of income taxes$26.4 $(4.9)$63.9 
Schedule of Changes in Unrealized Appreciation (Depreciation)
Changes in unrealized appreciation (depreciation) related to investments are summarized as follows: 
 For the Years Ended December 31,
(in millions)202120202019
Change in unrealized gains (losses)   
Fixed maturities$(105.9)$96.0 $93.3 
Other investments— (14.3)4.4 
Other and short-term investments(1.0)0.7 0.2 
Net unrealized investment gains (losses) before income taxes(106.9)82.4 97.9 
Income tax provision (benefit)(21.5)16.5 15.4 
Net unrealized investment gains (losses), net of income taxes$(85.4)$65.9 $82.5 
Schedule of Fair Value of Foreign Currency Exchange Forward Contracts
The fair value of our foreign currency exchange forward contracts as of December 31 was as follows:
(in millions)December 31, 2021December 31, 2020
Operational currency exposure$(0.3)$0.4 
Asset manager investment exposure(0.3)(0.2)
Total return strategy— 0.7 
Total$(0.6)$0.9 
Schedule of Realized Gains and Losses of Investment on Foreign Currency Exchange Forward Contracts
The following table presents our gross investment realized gains and losses on our foreign currency exchange forward contracts:
 For the Years Ended December 31,
(in millions)202120202019
Realized gains   
Operational currency exposure$16.5 $13.2 $5.7 
Asset manager investment exposure3.7 2.2 2.7 
Total return strategy13.0 61.6 22.5 
Gross realized investment gains33.2 77.0 30.9 
Realized losses
Operational currency exposure(28.9)(8.6)(10.6)
Asset manager investment exposure(1.0)(4.0)(0.8)
Total return strategy(12.0)(62.3)(17.6)
Gross realized investment losses(41.9)(74.9)(29.0)
Net realized investment gains (losses) on foreign
   currency exchange forward contracts		$(8.7)$2.1 $1.9 
Schedule of Restricted Assets The following table presents our components of restricted assets at December 31:
(in millions)December 31, 2021December 31, 2020
Securities on deposit for regulatory and other purposes$195.6 $227.5 
Securities pledged as collateral for letters of credit and other193.9 189.4 
Securities and cash on deposit supporting Lloyd’s business (1)
296.8 409.2 
Total restricted investments$686.3 $826.1 
(1) Argo Group is required to maintain “Funds at Lloyd’s” or “FAL” to support its business for Syndicate 1200 and Syndicate 1910. At December 31, 2021 the amount pledged for FAL was $296.8 million, of which $140.3 million was provided by 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)December 31, 2021
Level 1 (a)
Level 2 (b)
Level 3 (c)
Fixed maturities    
U.S. Governments$425.0 $417.4 $7.6 $— 
Foreign Governments232.8 — 232.8 — 
Obligations of states and political subdivisions171.3 — 171.3 — 
Corporate bonds1,983.3 — 1,980.5 2.8 
Commercial mortgage-backed securities418.7 — 418.7 — 
Residential mortgage-backed securities482.5 — 482.5 — 
Asset-backed securities173.6 — 173.6 — 
Collateralized loan obligations336.1 — 336.1 — 
Total fixed maturities4,223.3 417.4 3,803.1 2.8 
Equity securities56.3 41.6 — 14.7 
Other investments75.4 — 75.4 — 
Short-term investments655.8 653.9 1.9 — 
 $5,010.8 $1,112.9 $3,880.4 $17.5 
(a) Quoted prices in active markets for identical asset
(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 asset
(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)Credit FinancialEquity
Securities		Total
Beginning balance, January 1, 2021$7.0 $17.5 $24.5 
Transfers into Level 3— 1.0 1.0 
Transfers out of Level 3— — — 
Total gains or losses (realized/unrealized):
Included in net income — 4.2 4.2 
Included in other comprehensive income(0.8)— (0.8)
Purchases, issuances, sales, and settlements:
Purchases0.1 1.2 1.3 
Issuances— — — 
Sales(3.5)(10.6)(14.1)
Settlements— — — 
 Ending balance, December 31, 2021$2.8 $13.3 $16.1 
Amount of total gains or losses for the year included in net income attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2021$— $— $— 
(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 $24.5 
Amount of total gains or losses for the year included in net income attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2020$— $— $—