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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%

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