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Schedule I - Summary of investments - Other Than Investments in Related Parties
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract]  
Schedule I - Summary of investments - Other Than Investments in Related Parties
Schedule I - Summary of Investments - Other than Investments in Related Parties
As of December 31, 2021
(expressed in millions of U.S. dollars)
 Cost or amortized cost Fair value Balance sheet value
Assets
Asset-backed securities$512.6 $513.1 $513.1 
Residential mortgage-backed securities306.5 301.9 301.9 
Commercial mortgage-backed securities148.4 147.3 147.3 
Corporate debt securities605.5 602.6 602.6 
U.S. government and government agency388.1 385.4 385.4 
Non-U.S. government and government agency135.4 132.3 132.3 
U.S. states, municipalities and political subdivision0.2 0.2 0.2 
Preferred stocks2.6 2.8 2.8 
Total debt securities2,099.3 2,085.6 2,085.6 
Total short-term investments1,076.0 1,075.8 1,075.8 
Total equity securities4.5 2.8 2.8 
Total other long-term investments180.7 197.9 197.9 
Total investments in securities$3,360.5 $3,362.1 $3,362.1