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Long-term Debt - Schedule of Long-term Debt Maturity (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Junior subordinated debentures  
Debt Instrument [Line Items]  
Total $ 543.9
2023 22.3
2024 22.3
2025 22.3
2026 22.3
2027 22.3
Thereafter 432.4
Senior unsecured fixed rate notes  
Debt Instrument [Line Items]  
Total 325.8
2023 9.3
2024 9.3
2025 9.3
2026 9.3
2027 9.3
Thereafter $ 279.3