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Segment Reporting - Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]        
Gross written premiums $ 3,938.4 $ 3,698.5 $ 3,442.4  
Net written premiums 2,587.7 2,577.8 2,427.9  
Gross earned premiums 3,618.3 3,638.4 3,422.4  
Net earned premiums 2,410.5 2,527.5 [1] 2,293.3 [1]  
Losses and loss adjustment expenses 1,693.3 1,840.8 1,679.7  
Amortization of deferred policy acquisition costs 414.1 465.7 412.7  
General and administrative expenses 333.1 308.0 341.5  
Underwriting income (loss) (30.0) (87.0) (140.6)  
Corporate Expenses (64.3) (70.2) (54.5)  
Non-operating expenses (20.6) (32.7) (125.6)  
Net investment income 147.5 154.6 197.3  
Net realized and unrealized investment gains 56.2 98.5 97.1  
Realized and unrealized investment losses (47.4) (27.4) (10.9)  
Realized loss on debt extinguishment 0.0 0.0 (5.5)  
Change in fair value of loan notes issued by variable interest entities 0.0 0.0 (3.1)  
Change in fair value of derivatives (35.9) (65.1) (144.2)  
Interest Expense, Debt (14.3) (33.9) (20.2)  
Net realized and unrealized foreign exchange gains 40.0 (13.8) [1] (9.6) [1]  
Other income 14.7 49.8 4.9  
Other expenses 10.8 10.8 1.7  
Income (loss) from operations before income taxes 35.1 (38.0) [1] (216.6) [1]  
Income Tax Expense (Benefit) (5.3) (18.4) [1] (22.9) [1]  
Net income/(loss) 29.8 (56.4) [1],[2] (239.5) [1],[2]  
Losses and loss adjustment expenses 7,611.8 7,165.3 6,951.8 $ 7,074.2
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total $ 4,313.7 $ 3,970.1 $ 4,632.0 $ 4,996.6
Ratios        
Loss ratio 70.20% 72.80% 73.20%  
Policy acquisition expense ratio 17.20% 18.40% 18.00%  
General and administrative expense ratio 13.80% 12.20% 14.90%  
Expense ratio 31.00% 30.60% 32.90%  
Combined ratio 101.20% 103.40% 106.10%  
Non-operating expenses related to severance, retention awards and other non-recurring costs $ 19.3      
Non-operating expenses related to impairment charges on lease assets 0.4 $ 12.9 $ 12.3  
Non-operating expenses related to Merger Agreement     103.4  
Non-operating expenses related to other non-recurring expenses 0.9 1.6    
Non-operating expenses related to Effectiveness And Efficiency Program   18.2 22.2  
Interest rate swap | Not Designated as Hedging Instrument | Gain (loss) on derivative instruments        
Ratios        
Gain (loss) to net income from derivative instruments 0.0 (81.1) (130.2)  
Reinsurance        
Segment Reporting Information [Line Items]        
Net written premiums 1,199.0 1,297.7 1,251.1  
Net earned premiums 1,118.8 1,287.7 1,255.2  
Losses and loss adjustment expenses 2,148.4 2,095.7 2,605.9  
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total $ 2,148.4 $ 2,095.7 $ 2,605.9  
Ratios        
Loss ratio 63.00% 74.40% 73.10%  
Policy acquisition expense ratio 19.80% 19.10% 21.10%  
General and administrative expense ratio 10.80% 8.60% 8.90%  
Expense ratio 30.60% 27.70% 30.00%  
Combined ratio 93.60% 102.10% 103.10%  
Insurance        
Segment Reporting Information [Line Items]        
Net written premiums $ 1,388.7 $ 1,280.1 $ 1,176.8  
Net earned premiums 1,291.7 1,239.8 1,038.1  
Losses and loss adjustment expenses 2,165.3 1,874.4 2,026.1  
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total $ 2,165.3 $ 1,874.4 $ 2,026.1  
Ratios        
Loss ratio 76.50% 71.10% 73.40%  
Policy acquisition expense ratio 14.90% 17.70% 14.20%  
General and administrative expense ratio 16.40% 15.90% 22.10%  
Expense ratio 31.30% 33.60% 36.30%  
Combined ratio 107.80% 104.70% 109.70%  
Operating Segments | Reinsurance        
Segment Reporting Information [Line Items]        
Gross written premiums $ 1,597.0 $ 1,656.4 $ 1,485.5  
Net written premiums 1,199.0 1,297.7 1,251.1  
Gross earned premiums 1,479.2 1,612.0 1,494.9  
Net earned premiums 1,118.8 1,287.7 1,255.2  
Losses and loss adjustment expenses 705.2 958.6 917.9  
Amortization of deferred policy acquisition costs 221.6 246.0 264.9  
General and administrative expenses 121.3 110.8 111.7  
Underwriting income (loss) 70.7 (27.7) (39.3)  
Operating Segments | Insurance        
Segment Reporting Information [Line Items]        
Gross written premiums 2,341.4 2,042.1 1,956.9  
Net written premiums 1,388.7 1,280.1 1,176.8  
Gross earned premiums 2,139.1 2,026.4 1,927.5  
Net earned premiums 1,291.7 1,239.8 1,038.1  
Losses and loss adjustment expenses 988.1 882.2 761.8  
Amortization of deferred policy acquisition costs 192.5 219.7 147.8  
General and administrative expenses 211.8 197.2 229.8  
Underwriting income (loss) $ (100.7) $ (59.3) $ (101.3)  
[1] Net earned premium has been corrected for immaterial errors in relation to gross written premium and reinsurance premium payables for periods 2020 and prior. Net realized and unrealized exchange gains/(losses) and change in foreign currency translation adjustment have been corrected to account for the correction of foreign exchange movements on underwriting premium receivables which should have been matched with an underwriting premium receivable payment for periods 2020 and prior. Income tax expense has been corrected for historic current and deferred income taxes on Aspen U.K’s branches due to the deficiency in the completeness and accuracy of branch data and associated application thereof in respect of local tax rules in various jurisdictions. Total revenues, net income/(loss) and other comprehensive income/(loss) before and after income taxes have been corrected as a result of the corrections mentioned above for periods 2020 and 2019. Refer to Note 26 in these consolidated financial statements, “Correction of Immaterial Errors” for further details.
[2] The opening balances for retained earnings, cumulative foreign currency translation, and the net loss and change for the year on foreign cumulative translation adjustments have been corrected to account for the corrections mentioned on the pages of the consolidated balance sheet and the consolidated statement of operations and other comprehensive income. Refer to Note 26 in these consolidated financial statements, “Correction of Immaterial Errors” for further details.