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Debt and letter of credit facilities - Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Total debt $ 663.5 $ 639.1
Senior Notes | 2024 Senior Notes    
Debt Instrument [Line Items]    
Debt, at face value 400.0 400.0
Unamortized discount (4.9) (5.2)
Total debt $ 395.1 $ 394.8
Effective rate 7.40% 7.40%
Subordinated Notes    
Debt Instrument [Line Items]    
Debt, at face value $ 273.7 $ 249.2
Unamortized discount (5.3) (4.9)
Total debt $ 268.4 $ 244.3
Effective rate 7.10% 7.90%